Nut

Important parts for adjusting primary chain tension on Big Twins from 1965 onward with aluminum primary drive:

• toothed base plate supplied as a set with countersunk screws and nut
• the long screw passing through the chain tensioner shoe into the nut behind the base plate
• the nut behind the base plate available separately.

These parts fit Harley-Davidson inner primary housings from 1965–2006, including Shovelhead, Evolution, and Twin Cam 88 models.