at 204 to retaining bars 206 in turn fastened beneath the table or bed plate 10 with screws 208 or other suitable means thus cams 26 39 can be interchanged by loosening the wing nuts 194 or the fixture 32 can be lifted slightly to permit the cam 26 39 to be swung down underneath the bed plate 10 when not in use the location of the fixture 32 between a cam 26 or 26 39 and the grinding wheel 14 lessens the chance of grinding debri interference with the accurate movement of the followers 40 or 40 39 on the cam any collection of debri adjacent the cam is readily apparent to the operator and conveniently removed after temporarily lifting the cam out of position in fig1 and 13 a modification of the fixture is shown to accommodate the tuuk 2000 and other skates with unconventional supporting struts such skates have a molded plastic blade clamp 100 34 integral with the plastic struts 102 34 the blade clamp 100 34 is gently curved to substantially follow the sharpened contour of the blade 98 34 the fixture support 44 34 is modified by two dowel pins 210 removably inserted in holes or slots 212 behind the lower jaw 68 the lower lip 214 of the blade clamp 100 34 contacts the two dowel pins 210 to properly position the blade.