Well bought myself a hw57 that popped up on here few weeks ago it arrived other day bit more rusty than expected!! .....,.    Some was pretty deep so getting that sorted was priority stripped it down internals wasn't too bad just full off gunk so got to work degreasing and cleaning Decided to remove as much rust as poss and touch up with cold blue for now The mainspring was typical post 2005 weihrauch trimmed and un seated so got dremul and blowtorch out and got re seated Then added a delrin guide nice tight fit Delrin pre load washers and machine polished the piston removing all burs New pist