I have an older model 110 that the bolt handle keeps working loose on.What I've been doing is, with the bolt in the reciever, tightening the piece at the rear of the bolt.This piece has a slot along the full face so I don't have a screwdriver wide enough to fill the slot.It works loose after cycling the bolt 20-30 times usually out in the field while i'm hunting which means it rattles.Annoying.Why is it coming loose?Am I not getting enough torque like this?Do I need locktite on it?The only modification this rifle has had is a bedding job.