Most (including my) end pin jack holes are 1/2". If the one you got has a allen screw and a tapered sleeve to tighten inside the guitar, it will need some fitting to get it to work. I chucked the StewMac pin with the sleeve in a drill press chuck and sanded it down to fit. It's a bit of a pain, but I think this is the only product on the market that will return a end pin jack hole back to just a regular end to function as a strap holder only.
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