Tips, Tricks or Jigs for Pinning AR Mags?

[X-man]

I just picked up a bunch of improperly pinned mags from a buddy. Instead of being pinned to 5 or 5.5 they were pinned to 4.5. He is very particular about his kit and couldn't stand the thought of extra holes in his mags. I got a deal, but now need to drill and re-pin a crapload of mags. In the past I measured each mag I was to pin individually. I think that would get very tedious with the number of mags I have to re-pin.

Does anyone have a tip/trick or plans for a homemade jig? The bulk are aluminum USGI and about a dozen Gen 1 PMAGS. Thx.

 

[Stevebot-7]

Just an idle thought, could you maybe file the follower a bit on the area it touches the rivet, for a little extra clearance using the same hole?