I’m using the adjustable system from McKenzie with the metal inserts that slide onto the posts. These are 300 inch antlers and I cannot get the inserts inside the antlers to stay affixed on the posts. I’ve tried Bondo, like it said to, but that didn’t work. Then I tried super glue, Gorilla glue, but it still wiggles. I’m thinking maybe these antlers are so big and heavy and the surface area holding them is just too small. Any suggestions?