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PDI Chamber Repair kit, $6.99 USD:

http://www.x-fire.org/aps2/e.re_chamberkit.html

I have used my stock CA set screws in my PDI hopup, they're not mutually exclusive. I believe they're 1mm set screws although when you hold it in your hand it looks a little bigger. The stock CA set screws may be a little bigger than the PDI ones but I experienced no stripped threading.

EDIT: If you have any RC hobby shops around you it wouldn't be a bad idea to check there. A lot of RC planes and cars use small set screws.

 

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Josephus, you need to utilize the "Modify" button located at the top right corner of every post you make. Instead of double posting, you can just modify your original post if you need to add more. That's only if you were the last person to post of course, otherwise it's a normal reply and not a double post.

Administrative duties aside...

Wow! That's a great link, I may even sticky that. Also, I never thought of tapping my hopup for a 3mm. I have the day off tomorrow, guess what I'll be doing!? I don't find the two-screw setup to be as effective, for my gun at least. I threw my stock CA hopup in a while ago for kicks and it performed admirably. Although recently I've come to question if it's the 1 hop-arm PDI hopup that was around before the Duralmin ones.