lots of good info around here
and here is some totally useless stuff LOL
going to buy a bunch of guides and go at it on the wrapper
gsb1201_m_KR 27X 8mm choke.pdf
GSB1201M_KR_GPS_choke_8mm.pdf
GSB1201 M KR GPS choke 10mm.pdf
oops, what's the best way to hold the guides on for test casting TIA