I don't think the ICS bevel gear is a problem. Those gears came out of one of my M4's, and they fit in the bushings of it and a couple other guns (including the Frankengun) just fine. Did it fit into the other bushings (the sector or spur gear)? Just a thought. I've changed bushings around for better fits before.
The drill machining is a nice touch. Welcome to the poor man's milling machine!
And as for taking shims off, a great tool I use is an exacto knife with 2 blades in it facing each other. Works great.
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"Anyone with a name like Amanishourbariki should give a few letters to the poor Ng family." - Snarfangel, Fark.com
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