Get a piece of 1/2" PVC X 5Ft and two 1/2" to 2" adapters and two 2" T's. Cut the T's in half with a hack saw so they fit onto your roll bar and then measure the distance between your roll bars and add about 5 inches (Mine was 46"). This is the length to cut the 1/2" pipe. Slip on the insulation. You may need to cut some more off to help fit. Assemble the whole thing so it resembles a capitol I. Bend upward on the 1/2" section and put it into place with the top up. Fits tight. I used no glue.
If I may interject, you can save a little work and time if you can find a PVC fitting called a saddle. It looks like 1/2 a tee designed to glue to the outside of a pipe drill a hole in the pipe, and glue on a smaller pipe. I'll try to post a pic later today. (I work for an irrigation company in sc is why I am familiar with them.)
I hadn't seen this post before I built mine. Here's how I went about it. Took about an hour to construct and also came to about $12.
Four 3"-5" Hose clamps
Two 1/2" PVC Ts
Four 1/2" PVC couplers
??" of 1/2" PVC pipe
It rests against the door surrounds as well as being held down by the clamps. I extended the Ts with pipe then put couplers on the ends to give the hose clamp bands a nice little channel to sit in. I glued all but 1 end of the long prop prop piece of pipe, that way 1 end can swivel when its installed.
I like the pipe insulation concept. I'll be adding that to mine so the PVC won't wear through the pipe over time.
Pretty funny. Been doing this exact thing on boat covers for years. Never thought of it being a problem on a Jeep top. I guess if you park on a hill of any kind, you don't have the problem.
In doing this with boat covers, we found that the smaller diameter stuff won't hold up to the weight of the rainwater/snow. So go with as big a diameter stuff as you can. It will support far more weight.
I'm gonna resurrect this cuz I need to fab a prop from my bestop 1/2 top. The back tonneau cover pools and birds swim in it. Problem is there's no round bar to attach the prop to, only the flat "bed rails". Any ideas how to attach a prop to the rails without anything on TOP of the rail (top is tight at that spot).