ORIGINAL: Kanga
I have found all the easy pull points where the body is larger than the shaft ( where body meets shaft) are a pain in the butt to pull from bag targets, but they are designed for 3d targets and in those they work fine.
If you think you need smaller body ones take them back to the shop and tell him the ones he should have ordered and exchange them.
That's the plan. I didn't think the inserts would pop out that easily, either.