Yes. I had the same problem with my custom Elwood due to a combination of cheesy strap-button screws and the fact that they had been fitted at a ridiculous angle (one around 20 degrees, the other around 30 degrees off perpendicular). The result was that, when fitted/tightened in the M workshops, the screws had bent at the body surface, where they were forced perpendicular as the screw head was tightened into the strap-button indent. The extreme dog-leg shape of the screw fixing the bottom button meant it broke as soon as I tried to remove it for a strap-lock upgrade. Luckily I did this before gigging the bass as there's every chance the screw would have broken while playing. Getting the remains of it out of the wood was a tricky job.