With the Jim Dunlop StrapLok, you'll never have your dulcimer strap come unfastened again. Over time, even the best leather strap ends can become flexible, and slip off the strap button, usually at the worst time.
Replace your existing strap buttons with the StrapLok, and then you can use the oversize strap retainer to keep your dulcimer strap in place, all the time.
This system works only on "regular" strap buttons - if you have a strap/output jack combination on the tail of your dulcimer, then this system will work only on the head end of your instrument.