Hi all,

there is one thing some may be missing here. That is that retrofitting is not possible (to my knowledge) on mast bases unless the mast rotation pivot is bolted in.

The mast bases that came standard with these had a pivot that had a space before the cone of the pin that fits in the cup that captured the plate, keeping it attached to the mast base.

For instance on the mast base on 1766 the pivot is pressed into the cast alloy base and the cone that goes into the cup is flush underneath the alloy, no room to capture the plate.

But all is possible if you bolt through a new pivot or make a complete new base.