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I've had these before and had no problem and on the back of various recommendations decided to shell out (£18 is a bit steep in my opinion, so one star down for that) for a pair to fit on my Gibson SG. With a bit of thought I could have avoided what happened, but I simply followed the enclosed instructions like many would. The thing is the SG is a slim guitar and on my model Gibson have fitted two different sized screws and strap buttons. As instructed, I started drilling 22mm into the neck one and suddenly noticed a bit of silver dust... I was being cautious so hopefully little damage occured - but I was obviously drilling into the damned truss rod. Even then, with the hole at maximum depth the provided screw was too long for the strap-lock mechanism to work, so I spent half an hour searching for a screw in my shed that would do the job. A royal pain as under normal circumstances this fit should be a 5 minute job. Dunlop... sort out the price and provide a cautionary warning and you will be back up to 5 stars.
If your strap is quite thick there is no way the shaft on the button is going to be long enough. And you will need to find an alternative strap. And when you do, you will probably need to snip away material as said shaft is very wide. The locking mechanism you press fit on (with pliers) is flimsy and I destroyed the first one I tried.
The screws that come with the strap locks are not the same size as the stock screws on most guitars. To get them installed, I had to file down the head of my stock screws (I can confirm this for Spector, Ibanez, and Dean basses). I would suggest that method as opposed to other suggestions I received of "drilling" the hole out in my bass. Needless to say I'm still a bit ****** off about the needed adjustment that seems to stem from a design flaw.
The Straplok itself works well. The installation hardware, mainly the screws, are terrible in design. The heads of the screws strip way too easily, even if you wax the top of them. I was not able to screw them in all the way so I had to use my drill to remove it, which ended up ruining my guitar. They need to come up with a better design for installation.