The Contest 29 mast is stepped on the cabin top and is a tabernacle design.
The halyard winches were originally mounted on the mast, but my dad had moved them back to the cockpit to make it safer and easier for him to sail single handed.
He had mounted halyard blocks on the tabernacle as part of moving the halyards back to the cockpit.
Over time though, the pressure placed on the blocks / tabernacle to raise the mainsail caused the lag bolts that mount the tabernacle to pull loose.
I decided to move the blocks off the tabernacle and designed a new mast base plate to put the blocks on.