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I need to secure a new bow roller to the bows of my boat but I cannot access the underside of the deck to place a backing plate. Can I buy a marine equivalent to the butterfly bolts which are put in domestic plasterboard walls to do the job?
I would steer clear of any butterfly bolts. The bow roller needs to be firmly bolted down with a backing plate and stainless bolts and nuts. Perhaps you could explain why you cant get to the underside of the deck to fit a backing plate. Dave R.
Dave - more a case of too difficult. To access the underside of the deck I would need to remove a great deal of solidly installed internal fittings and I was hoping to avoid this. I appreciate the load area on what I think are actually called toggle bolts could never be as large as a backing plate but I was hoping they could do the job if available in SS.
There are a lot of unknowns on this one. What size and type of boat? What size Mud weight? What waters will the boat be used on, if sea going then the forces can be extreme. What construction is the deck?
If the deck is suitable, ie in thickness and construction and the forces are moderate, then large Stainless Steel screws straight into the GRP could be suitable, assuming correct pilot holes are used. However, it also depends if you are hand hauling the mud weight or using an electric windlass or manual hoist.
best regards, Richard.
A man who dares to waste one hour of time has not discovered the value of life. Charles Darwin
It's an Alpha 29 Sportsbridge and it has a single moulding from the cockpit to the bow. It is used on the Broads only and has a sizeable mudweight which is operated by hand. I had thought also of screwing into an epoxy mix. See picture which shows the bow roller loosely fastened at present.