tabernacle moves up and down

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Re: tabernacle moves up and down

Postby BreezingUp » Wed May 30, 2018 1:03 pm

Follow-up: I had someone attach the crutch to the thing at the bottom of the cuddy (compression post?) with a long screw, and now the crutch stays in place. I'm sure most people could make this fix on their own, but I lack a metal drill.
1982 DS II #12047
Posts: 20
Joined: Sun Jun 04, 2017 4:59 pm

Re: tabernacle moves up and down

Postby thistle3930 » Thu May 31, 2018 11:31 am

I have exactly the same situation. The visible mast support under the tabernacle should be on a mast step that is screwed to a piece of wood encased in fiberglass under the cabin sole. Under this is another support which goes to the hull. The wood on my board was completely rotten. I was able to squeeze water out of it after I cut the top layer of fiberglass off. The attached photo is of the top of the lower support post from the hull with the fiberglass and most of the wood removed. All of the wood is now removed. I plan to build up the bottom of the "box" to the top of the support tube with fiberglass then glass in a piece of marine plywood.

Thoughts on this plan will be appreciated.
Mast Step Cut Out.JPG
Mast Step Cut Out.JPG (32.4 KiB) Viewed 1099 times
John Garner
DS II 7956
Posts: 18
Joined: Thu May 03, 2018 1:51 pm

Re: tabernacle moves up and down

Postby SUNBIRD » Fri Jun 01, 2018 4:50 pm

Interesting to note that the original version of those install instructions from O'DAY list an additional pin in the parts list! I suspect that was to insert through the base of the mast to lock mast to original maststep in cuddy. Gee, it is interesting to find out that my 1979 DS II (#10201) was not the only one built with the mast step not lining up with the compression post (plastic pipe) under the cuddy floor! Mine had cracked sometime before I bought the boat In 1996 and I guess the previous owner had tried to fix it, however...he wasn't all that skilled in fiberglass repairs and so early in my ownership I was out for a glorious sail and suddenly heard a loud BANG! The rigging went slack at the same time and it did not take long to notice that the crack In the cuddy floor was now very obvious and the mast was causing a lot of flex! I made it back in, and after unstopping the mast (mine is still one-piece, no hinge yet) I removed the mast step and placed a 1/8" thick aluminum plate (about 6" x 9") between the mast step and the cuddy floor. That allowed me to finish that first season (short one, only in for a month). That Winter I cut an access panel in the cuddy floor and rebuilt the mast step area, starting by replacing the well rotted out 3/4" plywood under the mast step. I then added a 1/4" thick aluminum plate under the mast step to spread the load over a larger section of the cuddy floor. Nine years later, I finally rebuilt the area correctly by moving the compression pipe so that it is now directly under the mast step, and again replaced the plywood underneath (I didn't seal it well enough the first time and it rotted out again). My mast now stands slightly taller as I ended up raising the mast step area of the cuddy floor about 1/2" or more while fixing things.

Our Day Sailers (like most O'DAY Boats?) are beautifully built where you can see it, but hidden areas are not always quite so "perfect"!
CB-rig_fwd blocks.jpg
The plate that I added between mast step and cuddy floor
CB-rig_fwd blocks.jpg (140.6 KiB) Viewed 1094 times
rebuilt mast pipe1.JPG
My rebuilt mast step area-bilge
rebuilt mast pipe1.JPG (71.93 KiB) Viewed 1094 times
DS II under cuddy stringers.jpg
I ncase anyone needs to cut into cuddy floor, this is the approximate location of the "deck beams" that support floor
DS II under cuddy stringers.jpg (53.43 KiB) Viewed 1094 times
Rod Johnson, "SUNBIRD"
1979 DS II, # 10201
Posts: 99
Joined: Tue Oct 19, 2004 6:05 pm
Location: Massachusetts


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