Mooring Chain

My boats stay on moorings. To prevent chaffing, there is a 4 foot section of polyethylene pipe around the chain. The pipe needs to be held down so it stays where it is needed. Historically, I've passed a bolt through a link in the chain as a stopper. The bolt has large washers so it won't slip through the link in the chain. I use a lock nut so it won't twist off. On my Nautique mooring, the bolt has been there from the beginning. On my sailboat morning, the bolt falls off every summer. I've used new lock washers each time.

Any ideas about another way to secure the pipe?

The pipe prevents chafing of what? The chain on the bottom?

Jim,
Double nut the bolts one being a "jam" nut. It worked for many years before the nylon locking nut was invented.

I will likely try the double nuts. I used stainless steel chain the last time I changed it to see if it would last longer. The guard is common for the mooring company that sold me the the chain.

I might try using a carabiner instead of the bolt.

Good idea Thanks.