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Compass Marine How To | all galleries >> Welcome To MarineHowTo.com >> Seacock Backing Plates / Alternate Method / No Through Bolts > Installed
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10-APR-2009

Installed

Here is the tapped fiberglass backing block installed and ready for curing. Let it cure overnight and in the morning go remove the thru-hull, and the flange, then clean them of the wax.


The last step after de-waxing the thru-hull and flange is to bed them with underwater rated marine sealant and install the seacock, hose barb and hose.


You now have a life long backing block, with replaceable studs, and no extra holes in your hull. Simple and easy..


I choose to use replaceable studs because in the event they become buggered you can simply replace them.

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Guest 14-Jun-2015 17:48
My planned variation on this method is to install stainless 1/4-20 T-nuts into the backside of the backing plate to have a stronger connection than threaded fiberglass. I'll stick a little electrical tape on the T-nut holes so that the epoxy won't squeeze into them.
Guest 13-Feb-2013 10:29
Why not just use bolts threaded in from the top? It seems like the threaded rod with a nut on the end is basically the same thing as a bolt, just more work to make. In theory you might be able to remove the nut and not the rod, depending on what's tighter on the rod, the G10 or the nut. But why is that useful?
Michael 28-Jul-2011 02:19
Couldn't you just use flat-head bronze machine screws, countersink them on the outboard side of the backing block and eliminate cutting threded rod?
John Hardy 24-Dec-2009 16:48
If the underside of the block is counterbored to take a nut, this could then be epoxied in place to prevent it turning and making it captive. The flange would then be bolted to the backing plate and could be removed as necessary. This would eliminate the need to tap the fibreglass and not sacrifice any strength.

Now if there is some point that I have overlooked, please let me know since I am about to start, using this approach and would like correcting information before getting "stuck" into it.

Boatseeker