[Public-List] Spreader bases on newer hulls.

[Mike Lehman]

I had a similar problem...the rivets (4 each side) had broken and the only 
think holding it together was center bolt. I elected to thru-bolt the plate 
by drilling out the rivets. These take a lot of stress...thru-bolt them




~~~_/)_/)~~ Mike Lehman ~~_/)~~~


-----Original Message----- 
From: Jonathan Adams
Sent: Monday, March 24, 2014 10:50 AM
To: public-list at alberg30.org ; David Cooper
Subject: [Public-List] Spreader bases on newer hulls.

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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