Front left Susp. Adjust. bulkhead, CNC-machined and hard coated T6 duraluminum, with eccentric nylon hubs will enable you to adjust the tightness of the front belts. The new nylon hubs have a small notch that sit in slots around the hole in the bulkhead; belt tightness is adjusted by rotating the hubs to different positions. The advantage of the nylon covers is that they will eliminate any ball-bearing tolerance differences, eliminating the possibility of a hard-turning middle shaft.