Hi Ralph think I found it. USD38 for a tap!

Look under Vg 5, there're two actually. One of them is called spiral flute, have no idea what that means.
http://www.e-taps.com/ofertapage%20140.htm

I don't think the blade bullets would have better ranged over back spinning bbs, but they definitely provide better flight stability IMO.

There is a company which produces bbs much like the blade bullet, with fins on the bb itself. I read from reviews it was a failure though.

Thanks for the workaround tip, Gippeto. After reading abit on this forum I realized that spudders would rather fabricate a component as cheap and practical possible while maintaining functionality than taking the high cost techy route.

Still, it would be nice if I could tap my own seat.

Metal, mainly brass or steel. Anyways it's either a UNS thread or a special class of thread (can't remember but it's called special valve thread or something). Edit: Think I found it. It's Valve Screw Thread DIN 7756. What I found on Schrader website: http://img172.imageshack.us/img172/9023/47109756...

The internal thread to accept a schrader is as follows: Metric: 5.30 mm OD x 0.706 mm pitch English: 0.209 in OD x 36 tpi I've been looking for this tap everywhere but can't seem to find it, even in specialized stores. If anyone could tell me where I could order this tap online I would be grateful. ...