Pictures of the problem areas as requested (Sorry if they are huge). The 42 is a reweld build that was a combo of Robert Naess & Phillip Stouts work. MG3 Tripods are both DISA mfg.
First picture is the cocking handle problem. As you can see the cocking handle rivets hit the top of the tripod hooks. Should I grind the tripod hook or mill the rivet heads?
Second picture is that of the trigger mechanism. The tripod trigger is way too far back to work. Is there an adjustment or is it just bending/fitting the trigger mechanism?