The silver ones are very rare! There's actually more finishes than I would have thought on those early lights. I suspect Mag was using them to test new finishes because they were small and easier to take a loss on if the finish didn't come out good. I've seen just about 10 finishes on them total. The full size Mags didn't start getting a lot of finishes until the mid 1990s.
I usually save whatever good parts there still are like the head and tail cap but pitch the body. I've tried dozens of times to restore these but they're just too small to work with. I use a wire brush attached to a drill on the larger lights to remove corrosion but I can't do that on these. The tail caps are almost always corroded too and then the spring doesn't sit right. I will def give you a shout if I run across any like that. If you have any ideas I'd love to hear about them. I do get a dozen or so requests a year to restore Mini Mags but I usually turn them down unless the original owner can get the tail cap off.
Is ditching the body due to corrosion or unable to to get the cells out?
For cleaning corrosion on those, aside from a vinegar soak, a dremel has various attachments that can work well.
I've taken corrosion bubbles down with some careful scrubbing with round files.
I've got 3 mini mags on the way(one is a 3 aa) that are corroded shut. Hard part will be getting the caps off.
I've been planning to alternate soaking between vinegar and penetrating oils to try and get those caps off.
Have you ever used a hydraulic press to get cells out?
You'll likely have to sacrifice the bulb assembly but you should be able to press them out.
As for cleaning the inside, dremel tools are one option. Or, rolled up sand paper and time could clean the bores on them i would think.
bykfixer, I see what you did there. 
