Here it is. I designed it for 0.065 wall Sched 5 aluminum pipe
but if you want to save a bit of weight and you have
a highly skilled welder  you could go with 1.5 OD
0.035 or 0.049 wall aluminum tubing. Getting it bent
might also be a problem. 

Make your suggestions for improvements now before I upload
it to the ACRE web site.

Paul Lamar
 
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