I tried the Axiom banana plugs (both locking and regular) and found the non-locking ones were very loose fitting in the speaker post (M80,VP150) and I had to constantly tighten the locking ones as they tended to loosen. I went to the GLS locking bananas and have had no problems with them. The Axioms are just sitting in a closet.

M80s,VP150,EP500,QS8(4)