Hobie Cat 16 Mast Base 1.5 oz. I also have the matching

I also have the matching bottom block available  It is Hobie part # 379000110  Will handle up to and including 3/8" line

8 inch diameter waterproof Twist N Seal Hatch for Hobie kayaks

No need to worry about tire pressure

and sideplates are UV stabilized with carbon black for maximum protection

Wilderness Systems ATAK

Hobie Cat 16 Mast Base 1.5 oz. I also have the matchingHobie Cat 16 Mast Base Hobie cat part # 20640011 . For use on the Hobie 16 only. This is the part that fits in the bottom of the mast. You will need to drill out the 3 16" rivets holding old one on and install new stainless steel rivets for the new one.