-- Last Updated: Jul-02-13 3:45 PM EST --
I made my own and used Yakama's 1/4" lag bolts and their large plastic wing nuts. I had about a half dozen hanging around from over the years.
I semi copied the ones that kaymedic posted above, except for the mounting.
I used a 3" x 6" piece of 3/4" plywood and on the side that goes against the top of the yoke, I used a 3/4 inch forstner bit to go in enough to keep a lock washer and thin nut below the surface of the plywood.
On the top part after I inserted the bolts, I pounded it in so the square portion was embedded below the plywood surface. Then I tightened the whole works down as tight as I could get it, (this will prevent the bolt from turning when the large wing nut is tightened and loosened).
On top of the plywood, I used a 1/2" piece of closed cell foam and on top of that a 4" piece of high density foam.
Nanci added the top vinyl covering and did a great job sewing the four corners, (looks like it came from a factory).
Then we squished it down and wrapped the vinyl under the bottom and stapled it to the plywood with a finishing touch of black gorilla tape over the staples.
The finished product is 2-1/2" high.
When I tighten them down, it is very easy to get good and tight with that big wing nut.
Total cost = zip
If it ever stops raining here, I'll give it sea trials on the road and in the woods and report back how they work.
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