I can't be the first person to notice this. If I use the Tormek TT-50 Truing Tool it does a very nice job. But when I spin the machine around and install the Tormek DBS-22 Drill Bit Sharpening Attachment the slide does not run parallel to the stone. The solution of course is to install a diamond dresser in place of a drill bit. The first one I tried was a diamond burr with a radius end which worked pretty well. But Busy Bee Tools has what they call a 'Diamond Dresser With Handle' Part # D3744 which might work even better. Note Tormek: Maybe this is something you should look into. Steve.