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I tried using this on an Alvarez acoustic dreadnought that has a combo end jack/strap button, but its simply too thick to properly mount and secure a leather strap. This would probably be the main reason people want such device [since a regular strap button tends to be pretty secure]. So this product was a big fail for me.
Fortunately, it was quite inexpensive.
So, on to look at some other way to secure a strap on a combo button ... which is tricky since there really is very little space in that groove, once the leather strap is on.