Chem Guys Big Mouth Foam Cannon Lid Fix

This is my second attempt to fix this Chemical Guys Torq Big Mouth foam cannon whose lid design is so totally defective it won't stay on. The lid only threads on about 1/4 of a turn so there is not enough thread engagement to keep it on. Bump it? It comes off. Set your wand/foam cannon down on the driveway, the lid comes off, spilling your soap all over the place.

My first solution, the little pin to keep the lid from loosening was not totally successful. I had it come apart once with th