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Note that this is the revised Shaller design which integrates the threaded screw into the strap button itself. The new design has a larger thread than the prior shallers so you may need to drill the existing hole to get the correct size hole to support the larger screw size. If you can't figure out how to drill a hole or figure out the right size hex key to use to install this, you should chose a different brand or take it to a luthier. These are quality straplocks that will last the lifetime of your guitar or bass.
This isn't my first set. But I was honestly surprised and happy to see the changes they made. The button is the head of the screw which makes it a bit easier to install. It also seems more secure at the strap connections. I love my old Schaller locks, but these are better. I have seen some other brands and these are just awesome, and my experience from the old set means I don't even care what anyone else makes. I will put these on any guitar I buy.100%
This strap lock doesn't fit my acoustic or electric guitar, which are both standard sized fender guitars. The screw is too wide and I'd need to drill a hole into my guitar to fit it in. The lock doesn't allow you to change the size screw either as it's welded into the button.