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Hi Mark. I made my spider out of the strapping that holds bricks and tiles together in pallets. It's made out of steel and is thin abd strong. You can also drill it without breaking. You can find it lying about on most building sites as it is rubbish. It also comes in black, sometimes green. I cut two lengths the same size longer than the with of the tube. I got a piece of square tubing about 3.5cm x 3.5cm (it can be out of any metal) your's can be bigger because of the secondary size. I drilled 5 holes into the square tube 1 small to let the secondary screw fit in and 4 bigger to let the adjustmentscrews fit. On the opposite side of the large holes I made 4 smaller holes to let the end of the adjustment screws in, These I tapped. I attached the strapping to the side of the square tube with rivets. I then got some threaded rod from bunnings and I cut out 4 pieces about 5 cm long (you can use anything with thread in it). I then cut out a slit in the rod to fit the strapping in drilled a hole in the rod and the strapping attached a pin to hold it in place passed the rod through the tube attached wingnuts to the end for adjustment. Here are a few pictures hope it helps. Total cost about $10 to $20. and 1 days work. I used this set up on the truss telescope I made and have seen it used on bigger telescopes as well.
Regards cristian
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