I came across an Epiphone Explorer bass by chance in a music store in New Hampshire when I was on a trip(thank god, it's perfect for me) and from what I've heard, the strap buttons aren't very strong and certainly don't feel it either. I was planning on installing some Schaller strap locks in slightly different places, so that they would be in new holes rather than the ones already there that don't feel very strong. I was going to put them in these places

Any ideas how I should do this, how I should not do this, if I even SHOULD do this, or if I should get a professional?
your best bet would be to go with a professional, it'll be a cleaner job and they know what their doin'
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