This guy explains a lot about it, kinda wish I had seen something like this 5 years ago lol

Just giving you the benefit of my experience going through the motions and buying successively heavier and heavier duty machines that just weren't up to any task beyond making drapes. Light muslin drapes. If you can find ANY walking foot industrial machine, you will be in good shape overall, but the best thing to have is a compound feed walking foot. The Singer 29, 29-4, 29k etc. are all unicorns in that they have that universal direction thinger. Illustrated here by a rather annoying limey:

This is a perfect example of one. It's an hour or so from where I live, I searched in the Southeast, and didn't find squat for decent industrial machines on CL, but ask around, and check FB marketplace, etc. https://albany.craigslist.org/atq/d/hoosick-falls-singer-29-leather-patcher/7395677921.html

The Megacycle tidbit was in some DR200 or DRZ125 thread, guy managed to pry it out of a couple folks after flexing his "I'm a machinist, and I grind cams" line. I just realized I promised to steer you toward a decent sewing machine and never actually did that. Simplest route to take where you want to be is to find a used Singer 29K on craigslist in your are. Drive a couple hours and spend up to $500 if you have to. It's the machine you want. It has a walking foot, and a very unique feature called "universal feed" which means the foot can be turned 360 degrees and sew in any direction. They're ancient, bombproof, copied by everyone (mostly poorly) and you can still buy parts for them if needed. It's basically a staple in any old school cobbler shop. The Chinese Leather Shoe Patcher you can get on eBay for like $60 is a pretty close approximation of the 29K, but it's janky as all hell. Other used machines to be on the lookout for are Consew 206RB-5, and Adler 69. Those are the two I use every day, and I still want a 29K, just for grins, but I don't have the space or time for one just yet. 29's can tackle some pretty heavy stuff, well worth the money, and great for repairs in particular.

The stator is the only thing you haven't replaced yet, and the resistance is out of spec. I think you just answered your own question 😃