Abstract: An apparatus for holding an elongted shaft, e.g., a mill roll within a sleeve, e.g., mill chuck sleeve comprises first and second collar portions capable of being removably joined together and affixed to the shaft; a spacer adapted to be placed between the joined collar portions and the sleeve in abutting relation to the end of the sleeve; and a plurality of both first and second bolts adapted to pass through holes in the first and second collar portions, respectively, to contact the spacer, thereby maintaining the abutting relation between the spacer and at least a portion of the sleeve.