Singer 329K stitch length lever assembly. Lever assembly consists of lever #172170 with screw #990, washer #172173, thumb adjusting tube #172172, adjusting wedge #172529.  This assembly attaches to feed guide #172179 with lever set screw 140164. Plus feed guide set screw #140767, washer #170180 and spring #170179 (Scan 3).  Also stitch length cover #179760 with 2 mounting screws..  Price includes shipping  Parts marked for Singer 329K but may work on other Singer machines (Including 500 models)..