it needs to be a T-20 "security" torx....a regular t-20 will not work. I found sets for like $20 but the only place that had the individual bit in "security" style was Orchards Hardware Supply Store....and it was about $3.50 .....but I only went to hardware places like home depot, yard birds, and places like Wallmart, ace hardware, radio shack, and a few other places...
everyone had regular ones and the $20 sets were only at a couple of those....
Security Torx have the little hole in the end of the bit and regular torx bits have a flat end.