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PostPosted: Tue Apr 02, 2013 11:49 am 
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I get mine from a woodworking supply store. They often use it for making jigs and set up devices.

There is another option as well, and you'll find it quite strong, although I can't vouch for all makers using the same stuff - plastic cutting boards.


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PostPosted: Tue Apr 02, 2013 2:51 pm 
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You can order some on line at Lee Valley stores. Here is the link. I guess 1/4 inch thick would do the job. 8)

http://www.leevalley.com/US/hardware/pa ... 3576,32045

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PostPosted: Tue Apr 02, 2013 2:58 pm 
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Lomcevak wrote:
You can order some on line at Lee Valley stores. Here is the link. I guess 1/4 inch thick would do the job. 8)

http://www.leevalley.com/US/hardware/pa ... 3576,32045


Thanks Richard. How are the hakas coming along?

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PostPosted: Tue Apr 02, 2013 4:28 pm 
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They are finished. Just have to fit and cut the front groove for the akas and fix the abs half pipe with carpet inside, when i get the ship ;0). I will try to post pics soon. I will start to work on a PVC cart now. My trailer is almost finished also 8)

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PostPosted: Wed Apr 17, 2013 12:11 pm 
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Image

Here are the measurements you asked for. While not critical and you could certainly knock out something equally effective on your own, I know this one works. The rubber I used is about 7 or 8mm thick (1/4 inch or so). It’s reinforced with fiber belting. Get yourself some very sharp and stout punches - this stuff is incredibly tough.

The oblong holes allow the double length of cord to pass through, one above the other, without requiring the opening to be so large that the knot would easily pull through.

A word on bungee or shock cord - it comes in different tension strengths. the el cheapo stuff is generally a lot more “stretchy” diameter for diameter, and thererfore requires that it be stretched a lot more in order to generate much tension. This greatly taxes the cord and it weakens more quickly than the better, stronger stuff.

If you’ll buy the good stuff, 1/4 inch diameter (7mm) that is very difficult to stretch, you’ll find that you don’t need to stretch it more than just a little to hook the yoke on the Ama pin and even without much stretch the shock cord will hold the Ama securely, without bounce, in some pretty darn rough water. I think I cut my sections 16 inches long and knotted them as close to the ends as possible. I only have to stretch them about 1-1/4 inches to hook them on the Ama so there’s not much tension on anything yet they don’t allow the Amas in any conditions I've been in so far. I can push them down with my hand, but so far, no jostling on the water has caused them to move at all.


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PostPosted: Wed Apr 17, 2013 7:20 pm 
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Hey Tom, very nice picture and explanations. Thanks very much for your time and help on this.

Richard
:D

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PostPosted: Thu Apr 18, 2013 6:48 am 
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Thanks Tom for the measurement and pictures. i can't get to this for a few weeks but it is now on my to do list and you've made it easy.
T2

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PostPosted: Fri Apr 26, 2013 5:34 am 
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Thanks for the measurements and great idea! Now at the the risk of sounding not too bright, where do I buy the heavy duty truck tire sidewall rubber material? I searched online and found a lot for sale but mostly in bulk with no thickness measurement. My next guess would be to visit a tire place and beg them to buy a used tire. Hobie should offer this with all royalties going to you!

Thanks, Randy

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PostPosted: Fri Apr 26, 2013 8:21 am 
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Most places will give you a used tire if you ask. Or check your local city dump. Get a tire rated at least for class C or better and you should get the thickness as shown here.


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PostPosted: Fri Apr 26, 2013 9:53 am 
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Thanks Tom! Guess I'll go "kick some tires" and see what I come up with!

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