Ugh. Remember all the commotion I had with having to cut down that Avenger pin to fit my BRX500? Well the Matthews Drop Down Pin which I just had brought back from Vegas all the way to the UK doesn't fit it either. I can't understand why the Quadra swivel mounts are internally different to that of Elinchroms none portable range (D-Lite, BRX etc). If you compare the Quadra or EL adapter to the bigger studio lights you'll see what I mean. There's this plastic collar that prevents any of the pins going in far enough, whereas the Quadra fits perfect. I'm going to remove the mount and drill it out.