I ordered a pair of Kluson Duesenberg strap buttons. They seem to only be available through Duesenberg (USA in my case) for $25 a pair before shipping and taxes. That's almost twice the cost of new Schaller strap locks. I have a double cut (duo?) Jet that came stock with supposed Schaller strap locks. I actually don't have any strap locks for the strap side. These strap buttons have a small knob to attach the strap which supposedly works with the Schaller strap-end locks. However, the button is also threaded on the inside so you can attach a Gretsch like knurled knob on top. However, otnis an either/or - the knurled knob won't attach if you're using strap locks. Here are few pics from the stock button, comparison shot with the stock button (second pic shows the Duesenberg with and without the knob, flanking the schaller), prepping the drill bit (the screws were a smidge longer). I also showed how once the button is on, I (1) attach the strap - it is secure but not quite as secure as a regular button as the diameter is smaller, (B) attach a standard strap saver (rubber washer), and (III) then screw the knurled knob on top. I use Levy's tweed strap which has very thick suede strap ends and that with the washer barely fits on the knob. But it seems to work and it looks a lot better than the stock button - last pic.