After I learned how to apply the stuff [in airframe and powerplant school circa '75-"76, same time as I learned how to Magnaflux] I did that for the Navy in the Crane small arms shop for a while, and did it as an outside contractor for a while afterward. Among other projects, I did George Nonte's Ingram MAC 10 and a .44 AutoMag before he passed away, and any number of allow-framed handguns whose anodizing had worn, including almost a thousand Illinois State Police M39 S&Ws.
And, around that time, there were some local cops who talked to me real nice, and I redid their worn-finish aluminum D-cell Kel-lights and B-lights, in a day before the Mag-light folks were in business yet. Some of those big aluminum flashlights had somehow developed teeth marks on 'em....
Not sure as to exact stuff I had but every pin and detent, spring etc was done on that little SW37 with a bobbed hammer........ I remember putting it back together and the cross pin into the lug under the front barrel where the lock up was for the ejection rod had to be worn down a bit with some 6000 grit cockpit cloth to get it back in. Very nice and after decades of daily wear and tear it is just polished smooth in places vs worn off to reveal the alloy frame or steel barrel etc .......very good stuff !
Have ya heard of the use of Line-x truck bed liner on old surplus wood stocks like Mex & Swedish Mauser’s ? Awesome fit and finish and really nice !