Includes large knurled nut. Slug in mast is 1/2" diameter X 7/8" high.

Vintage Catalina masts were machined by hand. The resulting sail slot varies in width. If your sail entry slot is narrower than the 1/2" required for this stop, you have three options:

1) When the mast is down, slide the stop up from the bottom of the mast.

2) File or sand flats sides on the sides of the stop until it will fit into the sail entrance slot. Once inside the slot, there will be plenty of room for the stop.

3) Choose the original style stops, D1150 (see below under "May we also suggest"). This style requires a screw driver to tighten in place but are smaller at 7/16" in diameter.