Hmmm...re that Proxxon...it seems I wouldn't joining the big lads with proper 6.35mm cutting bits after all!

An owner/user on his site (below), reckons there's no 6.35mm collet available for it. there is a 6mm collect...but I guess that extra .35mm counts?!

http://www.tea-with.me.uk/index.php?cid=3114