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Old 09 March 2015, 17:55   #1
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Deck Attachment - My method

I thought I'd post a solution rather than a question for once. I have just finished mounting my bottle rack to the deck of my boat as part of a major over-hall. The problem was, as usual, no access under the deck and no desire to put in two inspection hatches so I came up with a plan.

1. Cut a strip of 316 stainless. This bit is about 60 x 20 x 6mm. Drill and tap an M8 and an M4 threaded hole in the centre.
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2. Drill a series of 8mm holes in the deck to cut a slot approximately 8mm by 21mm, so the plate just fits through.
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3. Push plate through the hole with a bit of string or thin cable through the larger tapped hole (so you don't drop the plate).
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4. Pull string/wire and pull plate flush to underside of deck. Using a fine screwdriver or pointy thing, position the plate and insert an M4 bolt. Tighten to secure plate in place. This wasn't the strongest fix so be careful. A washer would help but would leave the bolt head proud of the deck.
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5. Insert bolt. I wrapped the bolt in plastic then filled the remaining slot with epoxy to seal, but mastic type sealant would do. The epoxy did help grip the M4 bolt and retain the plate a little better. The setup shown was to lift the plate to the underside of the deck but still allow access to get the resin in.
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The plate was not greatly attached to the under side of the deck and rough inserting of the M8 could push it off, but once gripping, has given a solid connection. I was able to get about 28Nm torque tightening the M8, so a pretty solid connection and it will not pull out.

I am sure the method can be improved upon but it has worked well for me.

Phil M
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Old 11 March 2015, 14:38   #2
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Clever!
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Old 11 March 2015, 17:33   #3
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Nice one very ingenious 👍


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Old 11 March 2015, 18:37   #4
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Now that's what I like! Got a problem, sit down and work out the solution. Get materials, manufacture and fit. Voila! Bet you feel quite proud of yourself, go and get a beer.
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Old 12 March 2015, 14:42   #5
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I am. The problem had been on my mind for a while. It does help having the tools and toys to hand though.

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Old 16 March 2015, 08:33   #6
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Nice one Phil. I fitted my bottle rack yesterday. Used 6 M8x25mm coach screws and a lot of adhesive/sealer. I have 2 of the screws not biting fully which leads to a wee bit of movement so will need to pack these holes with wood and glue and re screw them in. Apart from that it seems pretty secure. I would prefer your method though as infinitely stronger. My mates rack was factory fitted with 6 self tappers and marine adhesive and many years later still fine, so mine might do. Will try it and see how it goes, if it strips out I'll revert to the nut and bolt approach.
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Old 22 March 2015, 06:43   #7
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I'm confused. Easy done I know. In picture 4 what stops gravity pulling the plate into the void?

Am I right in thinking the M4 is the stop the plate turning?
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Old 22 March 2015, 06:55   #8
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That's some heavy engineering - should support the porkiest of divers hanging off the rack in the lumps For lighter applications, a well sealed zip-toggle might have worked?

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Old 22 March 2015, 17:26   #9
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Quote:
Originally Posted by ShinyShoe View Post
I'm confused. Easy done I know. In picture 4 what stops gravity pulling the plate into the void?

Am I right in thinking the M4 is the stop the plate turning?
Yes, the M4 head is a tight fit in the hole and stops the plate dropping and turning. It was a delicate bit of work until the epoxy set to hold it all in place.

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