Do not cut the spring. A weak spring will lead to inconsistant ignition. The spring should be around 25-28lbs IIRC what Fred has told us.
Buy a tac bolt handle from sss and install the bolt lift kit, aka 38 special case head and ball bearing on the cocking piece sleeve. Measure the length of the sleeve then measure the length of the sleeve with the ball bearing and case head installed in it. The difference is the amount to remove from the bolt assembly screw. Do not measure the case and ball then remove that much as some people have posted before.