The only driver that works well on Ti allen heads is the Thorp Hex Driver made by MIP - that's the brand recommended by Don. The reason they don't strip the heads is interesting ... they are not forged to a hex shape like every other available driver but rather are ground from M2 drill rod. Grinding is a slower & more costly process but produces a true hexagonal shape with sharp corners that provide much better torque transmission.He said that he stripped original the screws when he removed the clip to get the coating done.
I bought a set here:http://www.hobbywarehouse.com/s.nl?search=thorp+hex&x=0&y=0
Here's the ANSI spec for button head cap screw size 4:the ones Lunsford is selling don't have the same tolerances, and the heads are sometimes too small.
Head diameter .201-.213"
Head overall height .051"-.059"
Head side height (the tiny straight area at the bottom of the curve) .015"
Hexagon socket size 1/16"
Any button head socket screw that does not fall within those dimensions is not being made to ANSI spec.