I have been building, from off cut 19mm marine ply, sub-deck blocking between bulkheads over the forward void. This is following Bob’s design instruction detail and the Gudgeon Bros lead in regard to mounting significant hardware. In this case these cleats are mounted over a void, so to ensure a solid mounting, the bonding shelf and blocking are combined. These forward cleats will serve a large part in mooring using the bridal and also in the deployment of a parachute sea anchor. This may seem a bit over the top, however I see no point having 300mm Nomen cleats with M12 cap sockets, if they are just bolted through ply inserted in the duflex and not have a substantial blocking arrangement.
I have also pre-drilled the bolt holes here because the backing plate is 10mm 316 (A4) SS, instead of the usual aluminium, as in the void I will not be able to check for dissimilar metal corrosion.
The blocking piece with large access holes and oversize bolt holes for silica and epoxy.
Deck on above – the screws are to hold the blocking to the deck and therefore transfer the hole location, the ply stops any possibility of the screws damaging the duflex laminate.
Above and below – bonding pre-drilled and threaded 316 (A4) SS backing plates to the blocking pieces.
Above and next two photos – waxed M12 cap sockets after bonding the plates and filling the oversize holes.
Below is the oversize holes filled with silica/epoxy mix threaded and sanded level.
Note: My silica/epoxy mix has 5% – 10% micro balloons hence the brown/mauve colour depending of course if the flash is used or not.
The Scrumble Project 