- Made of cast aluminum
- Attached with 3 stainless steel rivets
- Closes the top end of the extruded aluminum mast
- Molded cap has an attachment point for the upper sheave and sheave pin
- WindRider recommends using a 1-1/4 inch fender washer on either side of the sheave to prevent halyard slippage, this creates a roller for the halyard line to glide on as it raises and lowers the main sail.