The worst ones are the tiny ones on the throttle linkage and a few other places. I just got a new throttle linkage today, and 2 of the 4 little screws are already stripped. To me, even making a hex screw of that size is against logic...
I am sure that my redcat has some really bad screws. They have some slop to, so I may be using a driver that is a bit off, but I have ALOT of other cheap ones, and none of them are perfect. Will try some other set soon. I will go to the hardware store and see if they have any 3mm screw (VERY doubtful). Otherwise I will look for some sets online. Will probably need a new chassis too, because there are a bunch of screws that are flush with the chassis that are stripped, so the dremel will unfortunately make cuts not only in the screws.
Hubert