Originally Posted by
Jonny5
You can order cnc pistons from Ghea or Nick on Oople, both of which are in Europe. TD has some of their own coming out soon, but not yet available. If you have a set of blanks drilling isn't bad, but I recommend using a pin vise rather than a drill as the bits are small and break easily. Otherwise fill them by CA gluing a toothpick into the hole, trimming it off flush, and put a small drop of CA on both sides of the hole to cap it off.
I use 4 hole tapered 55's that I ordered from Nick. But I also used a hand-drill from snap-on with a #55 drill bit to drill out the stock blank pistons that came with the kit.