Hi Kevin
Had similar issue with my WM 250, I had a Dickson clone QCTP – 'Bison' – 0, from previous machine. I machined off the boss from the compound slide as the Bison was hardened, made a new locking bolt to fit… hunky dory. I scraped the top of the compound to clean up & ensure maximum contact area for the base of the QCTP, I also drilled 2 locating holes, at 90* in the compound slide to suit the Bison which has an anti rotation pin fitted, simple but effective…

I also had to make a new gib strip for the compound slide as the original strip was nothing more than a piece of crap MS plate so check yours …
original gib strip…

Replacement brass gib strip…

Replaced one of the gib adjusting / locking bolts with home made locking screw…

George.