Loxx Security Lock BC

Together with d'addario's universal strap locks these are the best on the market. Very easy to install. With thicker leather strap ends you need to punch in a bigger hole, but they will fit most straps. Because they are close to the body there is no chance of wiggeling out of the body. I like the d'addario's even a little better because you can use the original screws, they also function as normal strap buttons, are close to the body and they fit superb in every strap hole (unlike all others) they will never unscrew because they have a little lip that fits in the slit next to the strap hole. They are also 2 to 3 times the price of the loxx. Loxx is a very save bet, d'addario is the best.