210 resiliently deflects to facilitate insertion into the depression 120 which provides sufficient clearance for such deflection and the tabs 121 overlay the side edges 211 to retain the strip 210 in place the bearing member 220 may be described as a bar or shoulder having a cross section or profile in the shape of an isosceles triangle the bearing member or bar 220 is disposed between the posts 213 and extends longitudinally in a direction perpendicular to a line drawn between the posts 213 the longitudinal axis of the bar 220 defines angles of 45 degrees relative to each of the side edges 211 of the strip 210 the bar 220 is integrally connected to the strip 210 and equal length sides or surfaces 225 of the bar 220 extend away from the strip 210 and converge at a vertex the shaft 215 is integrally connected to the bar 220 and extends from the vertex to a distal end 219 the rotor 230 includes a generally cylindrical body 231 having a first relatively smaller hole 232 formed entirely therethrough and a second relatively larger hole 233 formed partially therein the holes 232 and 233 are both centered about the common axis 199 in a preferred manufacturing process the rotor 230 is integrally molded to a distal end of the shaft 215 on the strip 210 as explained below the rotor 230.