I've run in to this situation before, I've simply taken proven magazines that work perfectly all of the time, taken multiple dimensional measurements with a micrometer, and then carefully made some BENDS to replicate the measurements.

Until you've done it, you may not realize how much effort it takes to make these bends. And in my experience with OEM 52 magazines, when you've made the bends properly, it is a one-time job.

I'm not employed in this industry and my professional background is not in mechanics, engineering or gunsmithing. I'm a hobbyist, and a passionate gun owner who loves older S&W handguns. Given this, I would certainly describe what I've done as tuning a S&W Model 52 magazine.