The little cheep 12V dremel works well for this. I think they $10.00 at HF, will need to buy the wire wheels separately.
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Wire brushes (Just an example)
Amazon.com: 20pcs Dia 25mm Rotary Steel Wheel Wire Brush Set - Fits Dremel ,1/8" Shank ,Clean, Polish, Prep: Home Improvement{creative}&hvpos={adposition}&hvnetw=o&hvrand={random}&hvpone=&hvptwo=&hvqmt=e&hvdev=c&hvdvcmdl={devicemodel}&hvlocint=&hvlocphy=&hvtargid=pla-4583520384551948&psc=1
I agree.
A couple years ago I went back to corded with my Dremel (much more durable for sustained work) and I like the RPM adjustability. What I've been doing when hitting the wire wheels (unless it's minor or very detailed) is an 8" shop wheel and holding the hardware with pliers, needle nose, or vice grips (trying not to loose too much skin) and a drill, HF can be a real bargain with these wire wheels.
I used to use my blast cabinet, but the results were so dull, and I would have to wash bolts that were too greasy prior to the blast media. If too much grease built up in the cabinet, it was counter productive due to having to unclog lines and filter too often.
If I had a dedicated dish washer that I could rig up in my garage, maybe, but the finished product would still be dull and the time/ expense for poor results, makes it impractical. Maybe starbrite? or plastic?, but that becomes very expensive quick.
I've also tried the vibrator bowls with ceramic, and plastic with ok results. What I didn't like about the vibrator bowl.... the plastic bowl itself would vibrate itself apart in short order. I tried many different ways of securing and reinforcing the bowl and system, but it's unreliable for now.
What I have had great success in is a Kendal sonic cleaner, it has 2 transducers, works well. Unfortunately, the cost of one that can handle a large project worth of hardware will cost a small fortune. I'm not that guy. But on a small scale, or wait a long time, they are thorough, and very safe for the parts. Best use... carburetors!
I've rebuilt, or done partial restores on several cars, a boat, and 2 stand up PWC's (It's what I learned on when I was a kid).
I only recently got into these small tractors (GT's) a couple of years ago, I enjoy the simplicity of their design (lack of computers, modules). I prefer mechanical.
I think anyone working these larger projects for any length of time will have created their own magic for some things, horror stories for other things, and like me, having an eye open for good ideas, trying to simplify the cleaning task.
Building is the fun part, cleaning is the chore.
When I saw your jig, it was a duh moment for me... too easy. The bolts can be loaded up, wire wheel multiples in short order, flip the box lid over and do the same thing at least on the outer edge.
I like how your project is coming together and look forward to more pictures.