Washer would agitate but sometimes wouldn't spin

I did the repair largely according to the instructions in the video for the coupling. One significant issue made this much worse than it should have been. The coupling didn't just slide onto the shafts on either the motor or gear side. I tried putting them on as best as i could and put it all back together. I did a test run of the agitation and spin with the washer empty and, when that went well, attempted a full load.

During the full load test I started hearing a high-pitched squeal that varied in intensity. I let it keep running for a couple minutes to see if it would settle in, but then smoke started coming out from the machine! I pulled the plug, removed the clothes, vacuumed out the full tub and took the machine apart again. The motor was very hot but the gears, coupler, etc all seemed to be in order.

I went back online and watched the video again to see if I'd missed a step (I hadn't). I watched another video from a different website and got an important tip -- use a spark plug socket and hammer the coupler onto each shaft so the shaft is flush with the metal part of the coupler.

After doing this, I put it all back together again and very tentatively ran a test load and then several full loads and everything seems to be fine.

If I'd had that tidbit at the start, this would have been a 20 minute easy repair.