[Public-List] Spreader bases on newer hulls.

[vmarmei]

Hi Jonathan....
You should have a support Tube Spacer inside the mast over the 
through bolt. You can make even a stronger solid sleeve with thicker 
walls than a tube/pipe if you take a oversized round aluminum bar and 
drill it hollow to fit over the through bolt.
The length of the spacer should be .005 to .010 shorter than the 
inside dimension of the mast. The through bolt when tightened will 
make the mast and the spreader bases one solid strong unit.
The pop rivets or screws are there to prevent the spreaders with 
bases from rotating out of position.
Good sailing to you.
Villo A30-K641

PS: Lesson #2...
How to install said sleeve in place comes later and is subject to 
some serious negotiation as to the amount of beer you are willing to 
send my way.


At 10:50 AM 24/03/2014, you wrote:
>In replacing the rig on Cookin (Newer hull), Dave found that the 
>spreader bases are held on with a bolt that goes through the mast, 
>and below that to stabilize the tangs a collection of rivets. These 
>rivets are being replaced. In all other respects the bases seem to 
>be in good shape.
>
>The yard manager, indicated that the mast walls were not thick 
>enough to take a tap and a bolt, and he recommended going all the 
>way through with a bolt.
>
>Questions:
>
>1. Does anyone have experience with this issue? What is the role of 
>the rivets? I have an older hull, but bases are newer. I have no 
>rivets. The tangs hang off the central bolt with a triangular plate. 
>(this has issues too, but...)
>
>2. I would not have hesitated to put a tapped bolt / machine screw 
>in - anyone have any comments on through bolting versus tap and bolt?
>
>3. Is there a downside to putting through bolts in? Probably not - 
>as there were four holes there for the rivets. Clearly, one would 
>have to remember not to crush the mast when tightening these bolts.
>
>Thoughts appreciated.
>
>Jonathan
>197
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