Originally Posted by Les Ismore
I feel you could improve on the fasteners. Steel nut/bolts are heavy, costly, have more holding power than you need. Since the mount is only going to be subjected to a lot of motion (cartage/playing vibration, bungee cords), steel nuts/bolts as fasteners are overkill IMO.
That excessive motion can and will eventually cause the nuts to loosen... add lock washers, or locking nuts and coast/weight increases.
I do realize what you're using is easily available and works, but a plastic grommet type fastener or even zip ties would provide more than enough holding power.
.........maybe even velcro?