thin flat sleeve blank 128 39 which is adapted to be formed into cylindrical sleeve 128 fig3 thus the cut 156 is preferably present in the sleeve 128 because of its preferred method of manufacture as will be described in more detail below further because the blank 128 39 is thin the resulting sleeve 128 is relatively thinwalled and light weight referring to all of the figures but primarily to fig1 and 4 it will be seen that means 164 fig3 is provided in the form of at least one tab 166 and preferably a plurality of tabs 166 168 170 and 172 which extend radially inwardly from the sleeve 128 and against which the holder 130 abuts when inserted into the first end 132 thereof the assembler need simply push the holder 130 into the first end 132 of the sleeve 128 until it abuts at the tabs 166 168 170 and 172 and the roller 114 is properly positioned for contact with the surface 16 of the camshaft 18 the roller 114 has somewhat different ends 142 143 only 142 shown than does the roller 14 it is noted that the tabs 170 and 172 are positioned so as to co act with the cut out 144 so as to properly align the roller 114 relative to the slot 148 whereby the axis of the roller 114 is parallel to the axis of the camshaft 18 thus the various tabs 166.