Noticed your comment that you retrofitted Schaller Straplocks.
My nice strap will not hold securely to the original Strap buttons on my new Epi EBO, so I tried to install the Schaller Straplock system.
The screw that secures the original strap-button on the neck/body junction plate is much larger and longer than the screw supplied with the new Straplock system. Not only does it attach the strap button, but it is one of the 4 screws that hold the neck securely in the neck pocket, so I think it shouold not be changed. The diameter is too large to fit in the Schaller Straplock strap button.
Did you experience similar complications and what was your work-around?