RE: M_Boats: soft covers/caps for nuts

Don't know any other word for what I'm looking for. All us us have nuts/bolts protruding inside our boats. Has anyone ever heard of a soft cap (rubber, vinyl, etc) to fit various sized nuts/bolts? Gotta be out there somewhere. I've thought of the dab of silicon, but I don't like that alternative. I'm looking for a specific product. I've searched the internet without success so far... t /)) Tom Smith & Jane VanWinkle M17/496 & M17/064