XO-1 spur-to-pinion adapter that includes the "Cush Drive"?

[Serum]

That stuff is tough as nails; Kudo's for you to take the plunge to try it. J

The problem is that the tap isn't meant for these hard materials; it literally pushed the part apart, rather than cutting it away. Without a special tap, i would cut a 2.7mm hole for tapping. (requires less force to cut the thread) The threads will be less deep, but considering the hardness of the material you don't need to worry. I sometimes use an oversized drill for the tap in aluminum that's less 'willing' to be tapped. With tough materials I use cheap (conrad, lithium) grease instead of oil for cutting.

It would be fair easy to make a motoradapter for that spur from aluminum, loosing the cushion. (it would probably mean less wobbling as well)