Sorry Steve but I haven't heard of anyone who routinely does refurb work on magazines. As for being nervous about trying it yourself, what have you got to lose at this point? Could they become less reliable than they are now? It'd really help if you could obtain one NIB or used magazine that is proven to be reliable of the same model to use as a pattern for your effort.
FWIW, farming the job out to a good pro pistolsmith would probably end up costing you as much or more than new mags. Skilled time costs money and this sort of job can end up eating enough of that to render the whole job extremely cost-ineffective (for you) in short order.
FWIW, some shopping around on the net and a bit of research on cross-compatability might knock some off of that $50/each for new ones. IME, there are often cheaper alternatives to the factory, even for the exact same item. Worth some time exploring, IMO, anyway.
Good luck.
