Retaining nut for TFL catamaran 110mm drive pn# tfl-503b78-A. See picture 1, the item is circled in RED. Picture 2 shows the tfl-503b78A drives that this will work with. Specs: (1) Color silver (1) Nut per package
NOTE: This will not fit part number ose-80108 (tfl-503b78), which has a bushing.
