Refixing Fold Down Seat in Tinny

Hi all

I have a Stacer 440 tinny, which is a tiller control with a fold-down Springfield seat for the driver that is mounted to the rear bench seat of the tinny via a Kingpin seat mount and deck base. The deck base is (or should I say "was") fixed to the bench seat by 6 bolts and nuts of a type that I have never seen before (a cylindrical thing that has a diameter mot much greater than the bolt that goes thorugh it). I was out crabbing the other day and when I leaned back in my seat to unsnag a pot rope from the leg of the motor, the fold-down seat came free of the bench seat (taking the deck base with it), pulling the "nuts" through the holes in the bench seat.

I now have a bench seat with 1 x 2.5" hole (for the stem on the deck base to go through) and 6 x holes that are around 10mm in diameter.

I was wondering whether anyone had any suggestions about how to re-fix the deck base back to the bench seat, as there is no access from underneath to use traditional bots & nuts, etc? I'm concerned that if I try, say, 12 gage self-tappers, given that the bench seat is only ali they may just pull straight back through with very little effort.

Any suggestions would be greatly appreciated!
Cheers


Dale's picture

Posts: 7930

Date Joined: 13/09/05

Mon, 2017-02-27 16:40

 I'd go to Bunnings and by a sheet of aluminium and a tube of sikaflex. 

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Deckie's picture

Posts: 1297

Date Joined: 03/04/09

Maybe

Mon, 2017-02-27 19:54

 Maybe you can adapt this.

I have them in my tinny......

 

http://www.bcf.com.au/Product/Blueline-Seat-Swivel-7x7-Black/168321?menuFrom=571482

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Cheers & Stay safe

Bucko's picture

Posts: 138

Date Joined: 08/05/10

The product you are looking

Mon, 2017-02-27 21:42

The product you are looking for is called Hollow Bolt or something similar.

They are for bolting where there is only access to one side.

Seems like it might be better to make an access hole and put in a backing plate though, depending on how thick the bench seat is? Might last longer....

sea-kem's picture

Posts: 14833

Date Joined: 30/11/09

 Sounds like a nutsert, very

Mon, 2017-02-27 21:53

 Sounds like a nutsert, very similar to a pop rivet type system. 

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sea-kem's picture

Posts: 14833

Date Joined: 30/11/09

 I can weld a plate on for

Mon, 2017-02-27 21:54

 I can weld a plate on for you if you get stuck mate.

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ranmar850's picture

Posts: 2702

Date Joined: 12/08/12

Rivnut is another name

Tue, 2017-02-28 07:25

for fitting threads to sheet metal where you cannot tap a thread or get a nut behind. I bought a kit containing both steel and alloy inserts, find it very useful.  ebay link to a quick search  www.ebay.com.au/sch/i.html     or go to someone like Hare and Forbes

Posts: 6

Date Joined: 08/02/17

Thanks guys - having googled

Tue, 2017-02-28 07:54

Thanks guys - having googled it now, I can see that the old fixings were definitely rivnuts/nutserts. I had never seen them before, so you learn something new every day!

Just ordered a 200 piece kit online, and I only need 6 to fix the boat, so I guess I'm going to have to start using them for fixing everything.

Cheers

 

Bucko's picture

Posts: 138

Date Joined: 08/05/10

Hey, there you go, I learned

Tue, 2017-02-28 10:02

Hey, there you go, I learned something too.

I'm in the structural game so sheet metal fixing is something I don't know much about.

Cool.

ranmar850's picture

Posts: 2702

Date Joined: 12/08/12

I've found them very useful

Tue, 2017-02-28 19:57

 used them in the LV workshop on site, bought a set myself. Used them for  securing the sheet ali cabinet on my home-made camp freezer, quick assembly stands for solar panels.....certainly beats putting light stuff together with nuts and bolts.

Posts: 6

Date Joined: 08/02/17

Fold-down seat = fixed. Thanks guys for the suggestions!

Mon, 2017-03-06 08:57

I ordered a rivnut set online and it worked a treat!
Fold-down seat = fixed

Thanks for the ideas, guys.

Cheers