I went for a nice ride on the south seawall to buy the best fish 'n' chips from Go Fish in Vancouver. I'm pretty sure Britain has way better fish 'n' chips though.
I stopped along the seawall on a bench to eat my meal, so good!
A man with a little girl( his daughter) stopped and asked me about my suspension onewheel, seems like he knew a lot about onewheels.
He finally introduced himself as Ondy Ma, the founder of Surfwheel, he was quite interested in my board. I went on to tell him the original "wood" Surfwheel that was the first onewheel I ever vesc'd with a Trampa 6 .
Funny you never know who you meet.

I took a Pint controller, both boxes and a stock battery but no bms in part trade at $50 value. However, the controller suffered damage from a vnr that shorted out.
Testing the controller revealed a massive short that blew the fuse on my test harness.
Probing with a ohmeter showed a short between a phase connector and ground, so further testing came up with shorted mosfets controlling that phase connector.
I didn't have new mosfets, but I had harvested a few used ones, it was straight forward hot air replacement. I ordered new mosfets now TPH2R608NH
The controller works well now and been patched with Rewheel.

@lia I was cringing when they were poking their fingers in the bms area.
I don't think they know that "voltage'' symbol and orange cable means high voltage that can kill, all Jeff said was "cool orange cable".
Orange cables in hybrid and ev cars means " don't touch, don't probe, don't disconnect".
I worked as a government certified auto mechanic for road service CAA -Canadian Auto Association and we had auto makers put on seminars on their ev's all saying don't f with orange cables.
I know there's a argument about AC high voltage is more dangerous than DC high voltage eg. Edison vs Tesla, however I would be really careful with high voltage of any sort.

Since there's a renewed interest in the Rewheeded OG Pint , it's time to expand the Pint range beyond the JW/Chi battery.
I had Lia's battery box printed up last year, but there was no real advantage past the Jw battery as I hated riding the Og Pint with it's wicked pushback, but with Rewheel, it's my favorite board.
I followed the writeup in Reddit, I had to open up two low mileage Pint batteries to salvage 30 cells. I have to buy a bit of large blue shrink wrap to make it look nice.
https://www.reddit.com/r/onewheel/comments/z75ivc/built_a_pintx_battery_for_the_pint/
But seriously, does the PX rear bumper make my butt look big?

A fellow local group member asked me to resolder the footpad sensor connector in the controller, he brought in the controller only, already taken apart, I replaced the footpad connector as it was too badly damaged and reflowed the hall connector.

A week later he had a code 16 and again asked me to repair his board, this time he brought in the complete board. The poblem was broken wire in the harness.
After reassembling the board, now a code 3 (over voltage) code came up, I had to open up the contrller and he had used thick silicone insted of flowable silicone.

It took an hour just to open the controller up and clean up the mess. It looked like he had damaged the 80v cap and the inductor during his assembly, but replacement of those parts did not cure the code 3. I now had to go into the battery box, no thick silicone on this, I used my test bms and the code 3 was gone, so the problem in in his bms, after consulting a bms repair expert, he advised to check the small capacitors to the left of the Max chip as they get knocked loose, however they looked fine, but the caps were coated with a real thick coat of conformal.
I used a toothpick and poked around the caps to remove the conformal and two caps came off with the conformal. I resoldered those back on and the code 3 was gone.
I rode the board for a few days and all seemed to be fine, but that is not to be, yesterday, I tried to test ride it again and a code 16 came up. I opened up the controller box again and test contiuity on the bms data wires and all was fine.
Then I used my test harness and the code 16 was still there.
I then used my test bms and the code 16 was gone, so the problem is in the original bms. I checked the bms write up and looks like the Vp1786 transceiver chip may be the problem, I had a few of those chips so no harm replaceing it, after scaping away the thick conformal, the chip pretty well fell off, two legs came unsoldered, replacement was straight forward but had be be careful not to lift the solder pads. No more cde 16 after that chip replacement.

I went for a long ride and turned the board on and off many times with no trouble codes.
Those early 4206 bms's were rumored to be troublesome, also if you need to replace the controller lid seals. I used thin double sided tape, but run your fingers over the part of the tape that you dont want to stick to the plasic case.

@ed_co Did the conversion today, I have to make another shim as the present one is a little too thin, leaving too little axle endplay. It runs ,but can't upload a video.

I machined this 6061 aluminum Pint end cover while waiting for the Pint 357 skeletons to arrive. I really have to buy some Ti fasteners.
No cnc involved, just mind numbing measuring and hand machining.

@ed_co No, I don't have cad capabilities, sorry. I'm the last of the old school that draw plans on a napkin and figures out the procedures and machining in my head.
My lathe and milling machine are all manual with DROs.
I finished the offset axle project today.
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These new 357 rails are way too nice for a everyday rider.

@glyph I've got the shims made, I'll get them in the mail shortly.

@ikaruspint It should be no problem pairing.

@ikaruspint "Disconnecting a Onewheel BMS (Battery Management System) involves disconnecting specific connectors in a particular order to avoid potential issues. The general procedure is to disconnect the balance connector, followed by the battery's XT60 connector, then the communication wires. It's crucial to wait after disconnecting the balance connector before disconnecting the XT60 to prevent errors. "
As long as the balance connector is disconnected first and battery XT60, next the other connectors can be disconnected in any order.
Remember the for reconnecting it's the opposite, the balance connector is last, also wear latex or rubber gloves as touching the bms circuit board with your bare fingers can trigger the bms to turn on.

Looks like TFL has a purposed minibike that can be triggered to do wheelies, much like a onewheel. I'm thinking of building a Hypercore or Superflux minibike with vesc control. I dugged out a NOS minibike kit I bought 10 years ago and forgot I had it.
https://wheeliefunbike.com/pages/wheelie-fun-bike-v1?fbclid=IwY2xjawL50MBleHRuA2FlbQIxMABicmlkETExckdjNU5DakY2eVd2OW43AR6sblUolG4Vetv-Kp5KtVE1Hb4hgfCJNSIfi7e2TpjnrbBms2-Kn5q1kGL3LA_aem_1pi4EkjQrcZ9gxcVCyfZeQ

@h7per Your original problem may have been a broken wire inside the main harness, these XR harnesses have kinks in the small wires that can break, the other is connecting the xt60 even for a split second may have destroyed the 4209 bms.
Can you get the main harness from the person that sold you the 4209 controller and bms?

@aiden1983 At this point I cannot give you any good advice, just guessing.
Just be aware throwing parts at it may not be cost effective and may cause a massive short that can cause a fire, ask me how I know.
I always plug in the battery outside after a repair.
Maybe look for a working Pint controller circuit board instead. Sorry.

@aiden1983 Do you mean there's still a short between the source and drain with all the mosfets removed?

@aiden1983 Sorry, I got mixed up with another post asking about a Pint bms.
These are the mosfets you need.

@ikaruspint The conformal coating is soft and is easily removed with a toothpick, not use metal tools.
The discolored coating is normal as the conformal coating goes cloudy under heat especially at the Xt60 solder points.
Use a heat station for smd component removal, the solder on most factory circuit boards is non lead and reqiues more heat than leades solder.

@ikaruspint Here are the little mosfets that affect cell balancing.

@ikaruspint Unfortunately , I have only one Pint BMS left that I use for testing, seems like Xr, Pint BMS's are getting scarcer.
If you're in N. America, try Facebook.