ORIGINAL: Zerodefect
tolerances are rarely followed with these screws.
You'll find in rc that sometime a .050 isn't allways .050, but a el cheapo .050 wrench will fit fine. Some times a .050 ball driver will be tighter than a standard .050, some times looser. You can measure the tips on every decent wrench out there today and they will all measure differently.
Really you need a selection of tools to deal with all the crappy bolt sizes out their lately.
I use hudy metric and standard drivers, Rpm ball drivers, and a set of those cheap L angle allens from harbor freight that often come free with car kits.
I noticed that there are a few screws that AE uses on the RC8 and B4/T4 that don't seem to fit any driver out there well except for the free L angle driver they include.
Shoot! I forgot those free allen wrenches included! Thank you very much buddy!
One more thing, I found that the spare screws of the same type, which I ordered online, are just the right size. This is like what you said 'sometime a .050 isn't allways .050'. Luckily I didn't throw away those free wrenches. Looks like I have to buy a set of HUDY now...