Notice:
The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.
Built this Center Support which sits on the mast tabernacle. The offset, both of the wood and the roller on top, align with the offset of the stern mast support. Note the router work in one pic to establish a tight fit with the redwood 4x4's into the tabernacle. I also set the stern mast support up a bit higher to parallel the mast with the boat, and allow easier cabin access.
Eye bolt and eye nut (3/8 SS) both tie the 4x4s together and provide tie downs to stabilize the support port-stbd, the 4x4 "feet" provide fore-aft stabilization. I adhered a rubber-like material under the fore-aft feet to both protect the deck and level them with the tabernacle. Other hardware tying the blocks together are 1/4 SS drill rod & glue.
The roller assembly was from Amazon: Attwood Roller Panel Spool/Keel Bracket Roller Assembly (11210 roller and 11252 bracket), about $30. Mounting of the roller also provides some port-stbd & vertical adjustment as it is wider than the 4x4 post.
I leave the support and tie downs in place when setting up/taking down to provide a nice, stable roller until the mast is moved aft far enough to drop into the tabernacle... never have to lift the mast weight. It is finished with teak oil... which seems to work well on the redwood.
Michael, I will get the measurements posted soon. The major variable is the overall height, but that is easy to establish before you bolt the two vertical pieces. Height is somewhat trailer and aft mast crutch dependent... I travel with the rear mast crutch up one pin from the lowest setting therefore allowing easier cabin access and it sits pretty level front to rear.
Note the two "wings" on the fore and aft sides after my initial use to provide stabilization when moving the mast fore/aft.
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.