Ummm... I've got a Pro lever rigged up on an XC4 calliper, but. Not sure if that's the lever you're on about, might be a bit old. It's the one with the silver adjustable dial on top. Sound about right? It's exactly the same as the one on my Psyclone - small pics here http://www.retrobike.co.uk/forum/viewtopic.php?t=207427