A direct link to varmint al is http://www.varmintal.com/abifu.htm

I have made a set of shooting sticks using these plans, 1/4 inch square metal tubing, a bolt, three flat washers and a wing nut. Simply cut two equal length sections of tubing to the desired length. Drill both sections in the same place far enough down to provide a good place for you gun when you are done. Bolt the sticks together placing a washer in the middle of the sticks to allow for smoother operation. A nice finishing touch is to use adhesive backed felt strips at the top to prevent damaging the finish of your gun. I found the felt last longer, and worked better than foam weather stripping I first tried.

My sticks are too heavy to carry when I walk through the woods so I only use them in a ground blind when I am set up and don’t plan on moving any time soon.