Havent seen anyone mention you should have a spring and ball bearing for the detent adjustment. Might well be goopy/worn.
Keep in mind it is similar (very, but!) to the LR90 and a couple of others. All of which came with both version cocking lugs, round (yours) and "swan neck", the parts diagrams will show this.
"I believe" (old memories) one the earlier models the pellet probe was hollow so whe closed air blow into the bottom of pellet probe then 90 dgree turn and behind the pellet. Then a change to a pin style probe (better for Crosman #2) . I am thinking for some reason your must have the correct bolt-not the hollow tube model- for the swan neck (Like on a Bam50 and maybe Mike Melick has one?) to fit. Maybe.
I have used the one you have, way back, wasnt bad cocking at all. Maybe just clean and polish and adjust detent?
Do keep us posted.
And have to agree don't bother with a clip, designed and succeeded as a single shot. Be happy.
Does yours have this trigger?
View attachment 436439 John