M 21 First,obtain a new non-auto lever $45 and return spring $5 plus $10 shippping(Galazan).Remove stock push bottom pin on old lever where it attaches to the trigger plate;same with inertia block.Push upper pin on old lever where attached to safety accuating rod. Replace with new non-auto lever and inertia block.Go to front of accuating rod;drill or enlarge hole to 1/16 (hole is transverse).Place spring over rod and trap using a 1/16 roll pin 3/8 in length.Rear coil of spring may need to be spread so that it does not catch on safety rod.I have done more than 50 and it takes less than a hour. No longer--out of business.BTW no simple other way as the accuating rod must work correctly to reset the trigger.
