Stripped Conical Set Screw Options

[Literati914]

I know these conical set screws at the shift linkage are supposed to be one-time use items and should be replaced every time .. but I reused a couple that I had on hand when assembling my restoration. So I added a dab of loctite blue to them and snugged them down. I was going to go back and change them out when most of the kinks had been worked out of the car. So, this whole time I've been worried that they'd loosen and drop out while out running the car.

So now's the time, I set out to do this yesterday and the rear one was stubborn but I was able to remove it.. then on to the front one, and an absolute refusal to move! The stupid internal hex stripped (of course), then I tried 4-5 techniques to remove it but none worked, only made things worse - so I guess it's a matter of drilling and trying an ease out now? I actually tried one already without drilling because the hex is so chewed up. It probably was not the optimal size either though. Don't suppose anyone's done it recently and can remember the drill and ease-out size specifics they used?

I hate small internal hex key bolts, they always seem to tend towards stripping - anyone know if a 356 set screw would work?
https://www.stoddard.com/pcg711189a.html

[GregAmy]

I've re-used those screws many times on both my cars. But I do clean off the threads well and use Blue Loctite Threadlocker Stick, love that stuff.

https://www.amazon.com/dp/B01LVW5294

There's really nothing unique about new ones versus old ones, except the new ones come with a tab of Loctite already on them. I do keep a couple extra hanging about and ensure the Allan socket is in good shape, otherwise it gets replaced.

Heat from a blue torch and a bolt extractor should work fine.

[SirAndy]

There's really nothing unique about new ones versus old ones, except the new ones come with a tab of Loctite already on them.

@GregAmy
That might be true for aftermarket screws but the factory screws have a metal tab inside the threads that will deform and lock them in.

That's why they are one-time use only.
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[ChrisFoley]

... the factory screws have a metal tab inside the threads that will deform and lock them in.

That's why they are one-time use only.
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No they don't. They have a plug of teflon that sticks out past the threads.