Thank mmiller for info. I will order 36641031 MAST BASE, H21 SE & SC.
Should I glue new dolphin ball to dolphin post? The main problem happened because ball started to rotate on the dolphin post.
Tom King thank you for sugestions.
I am coming to Hobie from sailing monohulls.
The first time I needed to leave Hobie on the mooring I did exactly what you described. It was left with the boom attached for 1 week and halyard connected to the boom end. No slack on halyard and full tension on mainsheet. Forestay fully tensioned by hylyard/mainsheet Mast rotator was cheated on the boom. Still mast was rotating about +/- 5-10 degree at the gooseneck. Well, one week later the line from rotator was ripped in half and front boom cap was ripped from the boom. Boom was bouncing on the tramp connected on the back side between hylyard and mainsheet. Mast was rotating.
The second time after repairing boom I left it for 1 week without boom. The rotation arm was tied with 5mm line to two sides. Still mast was rotating about +/- 1-2 degree. Much less. Well … week later. The line from the rotation arm to the port hull was ripped in half. The mast managed to rotate ball. Dolphin post drill hole through ball and mast base. We did not notice this at first. The mast dropped 1 inch down and was still rotating on the ball that was supported by front crossbar. When we tried to lower mast after sailing for one day we bended dolphin post because it was inside mast base by 1 inch.
The wind in the area could be 20-30mph and wave 1-3 feet. Is there safe way to have Hobie 21 on the mooring with mast up at 30mhp wind and 3 feet sea? There are some sailboats on the mooring and they are all ok.
Thank you very much for feedback