Please explain:
1 screw is striped and you cannot get it out? Just spins?
or you cannot find a screwdriver that fits the screw size? If yes, you need a expanded set, you can get them for $15-$20 for a set with a full range of sizes. My mini set has one that fits the GT screws perfectly, not sure size it doesn't say on it.
If you need the measurement let me know, they are color coded, so I could figure it out.
Cheers,
M