Originally Posted by Rover
The mainspring out of a GP/SP will work in the Speed Six. I had a Speed Six that I put the 9 lb mainspring in after I had the gun tuned. It works so pick the weight you desire of Wolff spring: 9, 10, 11, 12. I think a search here will turn up some others that have done the swap. The string is a couple of years old. I originally tried the Wolff Six Series springs and the trigger pull was not reduced much.
Bingo, that's what I wanted to know, thanks. Since my speed six is DAO/spurless the lighter weight of the hammer may require a heavier spring? So I'll start with 12# and work my way down checking reliability. I put a 10# Wolff in my SP101 DAO and it's been 100% reliable with no light strikes. I checked out the wolff spring set for six series. Reduced power=14#, a 16# and a heavy=17# so I guess stock is 16#. I don't under stand why since GP100 spring set is 9, 10 & 12#.