[quote name='beerdragon' post='528192' date='Jun 29 2009, 10:18 PM']I have a thick bass strap so the Schaller ones wont fit.i wonder if these will. you cant get much cheaper than the Jim Dunlop ones, £1. [url="http://www.shopwiki.co.uk/Jim+Dunlop+Lock+Strap"]http://www.shopwiki.co.uk/Jim+Dunlop+Lock+Strap[/url][/quote]
Apart from they start turning the strap button as the pressure between them is the only thing holding your strap there, so I used them years ago and it pulled them out on one of my basses.
Marvel ones are great on thick straps just maybe squeeze some loctite in there to stop them coming loose, I do this with Schallers as well.