Once tight I have no wiggle at all on mine, I have had no problems with it, if I did I suppose I could shim a little and or add straight pieces to either side to make the vise clamps longer or to make up for a not so perfect block, various solutions, or just go back to Ed's place and get a refund or new one. My drill guides have no slop and are center'd so no bit walking, can't think of a better jig tool. Kopper I hope you get it figured out if not give Ed a call. Don't know who you bought it from if it was purchased from a second party maybe it was damaged some how