I had a mosmatic swivel on the end of my hose for 3 weeks.One day I was washing and let go of the trigger and the swivel fails at the threads.Called Mosmatic and told them the story they say I overtightened it,over the phone they diagnosed it!I start to raise hell and tell them how can it fail three weeks in if it was overtightened,it would have failed sooner.Nope they knew they didn't make a bad piece and were not gonna warranty it.
So I wouldn't use one as a fishing weight.