mounting 9" handhold without backside access - SailNet Community
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post #1 of 17 Old 4 Weeks Ago Thread Starter
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mounting 9" handhold without backside access

I have a area where I want to install a handhold and I have been holding off because I can't thru-bolt the small handhold because it is not possible to access the backside of this area.
The location is vertical, each side of the companionway, where my sailboat slightly juts out. On the backside, I have a solid partition that meets in this location (aft head and aft qtr).

I was thinking of installing short 1/4" lag type stainless steel screws and with 4200 or 5200 caulk (neatly).
I never install screws in fiberglass and I don't like using 5200 caulk, unless I have to.

Any thoughts on this?
I really would like a short handhold at this location but I don't want to damage the fiberglass by using the above install.
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Re: mounting 9" handhold without backside access

Lags are a violent type of faster. Violent...my word
I wouldnt do a short lag into fg...

....edit...
You could probably lag into a lead anchor without over stressing the fg

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Re: mounting 9" handhold without backside access

A pic would help.

5200 will adhere your handhold permanently to the gelcoat. The issue is whether any serious force will just tear the gelcoat off, with the handhold.

What is the core material inside the glass at that spot and do you know how thick it is?

Without these answers, you could just drill through the whole thing, interior bulkhead and all. You could either use a s/s torx flat head machine screw from the interior, or just a s/s bolt to the exact length and use a washer and cap nut. Both would look okay inside. I think. That's why I'd want to see a pic.

What boat do you have?


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Re: mounting 9" handhold without backside access

Since it is unlikely that the fibreglass you want to fasten into is more than 1/4" thick, of course it won't matter how long the fastener is. Are you positive that your lag bolt idea with or without 5200 will take your weight or a guest's in a situation like a knockdown? Without through bolting this handhold it isn't a very good idea. Better nothing than something that might fail when most needed, IMO.
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Re: mounting 9" handhold without backside access

I think Minnie is on the right track but I would go a bit farther and suggest using a piece of 1 1/2 x 1/8 - 3/16" stainless flat bar as a backing plate. You could make a custom towel or paper towel holder from the flat bar by bending and drilling. If i'm visualizing your description correctly it sounds like the backing plate would cross the partition? If it does it will definitely be strong enough for a handhold in most any conditions. Even if it doesn't cross the partition it will be a reasonably strong handhold especially if anchored on the gelcoat side with 5200.
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Re: mounting 9" handhold without backside access

It's light weight... use super strong velcro type called 3M Dual Lock


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Re: mounting 9" handhold without backside access

Lag is the wrong word. I was thinking of a short ss screw, deep enough to go through the gelcoat and into the core, and use 5200 caulk.
Again, I have never used screws for anything like this, especially a handhold. I am always grabbing the sides as I am going through the companionway, especially heeling.
I have always stayed with away with any type of screws for any hardware, no matter what it is so I am extremely cautious about this method.
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Re: mounting 9" handhold without backside access

Mount the hand hold to a wood plate and use a healthy amount of dual lock. It will be strong enough for the intended purpose.

Specs for static loading are found in the spec sheet:

http://multimedia.3m.com/mws/media/9...sh-germany.pdf

for screws

https://www.clarkdietrich.com/sites/...ingOptions.pdf

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Re: mounting 9" handhold without backside access

Quote:
Originally Posted by pscoe View Post
I have a area where I want to install a handhold and I have been holding off because I can't thru-bolt the small handhold because it is not possible to access the backside of this area.
The location is vertical, each side of the companionway, where my sailboat slightly juts out. On the backside, I have a solid partition that meets in this location (aft head and aft qtr).

I was thinking of installing short 1/4" lag type stainless steel screws and with 4200 or 5200 caulk (neatly).
I never install screws in fiberglass and I don't like using 5200 caulk, unless I have to.

Any thoughts on this?
I really would like a short handhold at this location but I don't want to damage the fiberglass by using the above install.
Hi, I am not sure that I understand your reservations about permanently attaching the handhold to the boat structure. If I understand correctly the location where you wish to install the handhold is impossible to access from behind because there is a solid partition there. If so then that in my opinion simplifies things, simply drill holes through the glass and pilot holes into the solid partition, apply the 5200 to fitting base and holes and attach using appropriate length and gauge self tapping stainless steel screws. If unable to screw to the solid partition then drill and tap the fibreglass and use stainless steel metal thread screws, with the adhesive as well. Either way should achieve the required strength.
If I have misunderstood the situation then just disregard my opinion.
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Re: mounting 9" handhold without backside access

Dual lock is amazingly superior to velcro. It's what holds up most of our headliner and has very high shear and tensile strength.

However, it has two weaknesses. The first is by design. It can be separated by leverage, it's supposed to be able to come apart. If you were to lever the handhold to the side, it would release the dual lock. Second, the less intentional, is the adhesive for the strips does fail over time (ask me how I know). The two halves of the dual lock stay well connected, but it detaches from it's subsurface. Perhaps that could be overcome by better adhesive, but you'd need to remove what comes on it first. Maybe a version comes without any adhesive.


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