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Do yourself a favour and buy Schaller strap locks. They use Allen keys for the screws. I bought these and completely regret it. First one went in fine. Second one the screw stripped 3/4 of the way in. No way to get it out or further in. Big headache. Luckily I tried them on a cheaper guitar first. Schaller locks work really well and I thought these would too being that I’ve used Dunlop picks for over 25 years. Do yourself a favour and don’t buy these.
I wanted to love these, as I don't like the new Schaller design. However, step one in installing them is "drill a hole". Why? Because the screw it come with doesn't fit a lot of guitars. For example, I tried it on a Gibson Original 60s Standard, and a Players Strat, neither would fit. Also, you couldn't use the original screws with this, as the hold is too small at the top (screw head). So basically I have 2 completely useless strap locks unless I want to drill into a brand new Les Paul. Nope. Never buy them again. Thanks Dunlop, enjoy the last purchase you will get from me.