How long do they tend to last for you? I just tried this suggested "trick" for my Gibson SG at a gig and it worked perfectly for me. Easy, simple, and effective. I'm thinking I'd want to use it for other guitars I have with the same smaller strap pins as the Gibsons come with. This will allow me to use my Gibson leather strap safely on more guitars. I did try to buy a pack of washers from a brewer but got washers that are tougher and not as flexible as the Grolsch ones. I don't mind buying Grolsch 4 packs to get new ones, but I just wondered how long before they wear out?