How to deal with stripped out holes on Firewall

Not sure which forum is best for this, so I figured gotta go where the brains are, which is of course the Early A forum:) on my 66 dart, I have been removing and reinstalling the Voltage regulator like 50 times over the past 2 weeks. And now one of the holes is completely stripped. Currently I insert a piece of paperclip and then screw the screw in, but that is only good for 1x, then when I remove it I have to start all over. Any suggestions on how to deal with this? Thought about retapping the hole to next size up, but it isnt very thick so not sure how many threads I could get. Thought about getting a self-tapping screw, but since I take this on/off often I would fear the threads wouldnt hold up. Is there any sort of metal anchor designed to go in the hole permanent, then I can screw into the anchor? Maybe drywall anchor (the metal type)? How idiotic would that be?? help. p.s. ground is not a huge issue (would be nice) as I am attaching a separate ground wire from the screw to the battery ground terminal.

I can't really understand just why you are removing the voltage regulator so many times unless you are painting the firewall or have a wiring issue. But you could run a 1/4-20 bolt from the back side and lock it down with a star washer and nut , install regulator and put a nylock nut on there for easy removal. the voltage regulator pretty much has to be grounded very well to be effective.

for a store bought remedy use a nut sert (Harbor Frieght has the tool cheap.) or a rivnut