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Old 03 July 2013, 03:29   #1
Country: Ireland
Town: Castlebar
Boat name: Clewless
Make: Valiant DR 490
Length: 4m +
Engine: 60 hp ETEC
MMSI: Awaitng one
Join Date: Oct 2007
Posts: 1,330
Blind Big Head nuts

I am think about how to install blind Big heads to the deck of my rib so as to allow for the changing of the seats, dive bottles etc.

Option 1
Screw and sika flex to the deck as is.

Option 2
Screw and skia flex to the deck as is and glass over with the resulting hump.

Option 3

Grind back the fibreglass back to the ply wood about 6" all around the big head. screw to plywood and glass over. This option should leave a reasonable smooth deck without the hump in option 2.

Any thoughts /advice would be great


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Old 03 July 2013, 03:50   #2
Tim&Linda's Avatar
Country: UK - England
Town: Crewe
Boat name: BLACK BOSS
Make: humber & searider
Length: 9m +
Engine: 2x200 ETEC & 2x40
MMSI: ex directory
Join Date: Jun 2013
Posts: 580
i have put marine ply down then glass , then screw on a SR [ clean the bottom first of the deck ]

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Old 03 July 2013, 05:48   #3
Phil M's Avatar
Country: UK - England
Town: Whitehaven
Boat name: Cerberus
Make: Destroyer 5.8
Length: 5m +
Engine: 115hp Merc 4st
Join Date: Oct 2012
Posts: 458
I installed a pair of threaded inserts into my deck to re-attach the a-frame after the original screws pulled out (was a very rough day and the old fixings were 20 years old). The inserts have a coarse thread on the outside and a metric thread (M8 in mine) through the middle and are installed with an allen key. I glued them in with epoxy for good measure. The centre holes are all the way through but a blob of sika of epoxy at the end before fitting would fix that, if it is a problem. These are the ones I used and are made from 304 (A2) stainless so not quite as strong as 316/A4 but should be up to the job. Just add a few more if possible:-


I plan to make my own from 316 bar when I finally get the lathe up and running.

Phil M
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Old 03 July 2013, 12:01   #4
Country: UK - England
Town: Gloucestershire
Boat name: Osprey
Make: Osprey Vipermax
Length: 5m +
Engine: E-tec 300 G2
Join Date: Dec 2006
Posts: 4,015
If its to hold seats down then the only way to do properly is to cut a hole in the deck and fit from beneath. Then fit a stainless plate over the hole or glass the removed disk back in and paint over with non slip deck paint...
Chris Stevens

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