front idler wheel 34 to the idler axle shaft 74 the interference fit provides a rigid connection that constrains the front idler wheel 34 and the idler axle shaft 74 axially radially and torsionally thus the interference fit restricts the motion of the wheel 34 preventing high wear in the front idler wheel assembly 78 as is shown in fig5 and 6 the taper lock bushing 90 includes a first inner member 94 a second inner member 96 and an outer member 100 the inner members 94 96 have tapered outer surfaces 92 that are complimentary to and interface tapered inner surfaces 102 of the outer member 100 of the taper lock bushing 90 additionally the taper lock bushing 90 includes two types of axially extending holes full length holes 118 and half length holes 120 the full length holes 118 extend a length of the bushing 90 holes 118 are defined by a through hole portion 118 a which extends through the first inner member 94 of the bushing 90 and a threaded hole portion 118 b which extends through the second inner member 96 of the bushing 90 holes 120 are threaded and extend through the first inner member 94 of the bushing 90 therefore the holes 120 extend approximately half way through the bushing 90 and do not have a portion defined in the second inner member 96 in the illustrated embodiment there are a pair of holes 118 for every one hole 120 with.