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  #1  
Old 10-30-2013, 06:43 AM
Douglas Douglas is offline
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Join Date: Jul 2005
Location: Port Townsend , WA
Posts: 119
Default Mast Tangs

Gulp ! that's a heap of information you are after ,,, but all of it, is important information .

Both Brion and Joe's answers on this forum have helped me heaps , in the past .

Maybe you would like to search the forum for , mast bushings .

Of course Brion uses Skeen's (sp-?) book for scantlings sizes , but I found similar info in that Ferro Cement Construction book , by Bingham .

Without this forum , I wouldn't have been able to fabricate a complete new mast in SE Asia , on a pontoon , next to the boat !
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Old 06-21-2014, 10:40 AM
paramita paramita is offline
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Join Date: Sep 2013
Posts: 8
Default

So I'm looking at the size of my existing t-ball backing plates, the clevis pins at the bottom of my shrouds, and compression tubes available from rigrite (http://www.rigrite.com/Spars/SparPar...sion_Tubes.htm).

Currently all the pins for my shrouds at the deck are 1/2" or less. All my shrouds have the GIB 740-7 sized backing plate which has a 5/8" wide slot. Rigrite sells a compression tube (K-9632) with 1/2" I.D. and 5/8" O.D.

I'm wondering if there would be any issues simply using a 1/2" through bolt with that compression tube leaving the backing plates? I assumed it would be ideal to leave the backing plates in as it couldn't hurt to have the mast wall reinforced.

Removing the plate would would leave a 7/8" wide cutout which (from looking at Rigrites site) would allow me to use through bolts as large as 3/4".

I've attached a sketch of my proposed plan. Any input would be greatly appreciated.

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