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I just cut up foam from a thin black, sleeping bag ground protector (its about 4-5mm thick) oversized it length-wise. I glued it using a hot glue gun. I also cut an extra strip 4" wide to glue and run all down the join to strengthen it.
All up cost around $20 (already had the glue gun) and two years on it still looks good as new.
Have you been able to test the collimination of your OTA yet? I found mine was hard to adjust until I went the Bob's knobs route. Secondly take a bright star in and out of when its in the middle of a moderate eye pieces - say 13 mm and look how far the star jumps from the centre of your eyepiece when you change direction of the focus (In -> out or Out -> In). Mine was rotten - jumped about 1/3 of the way across the eye piece on a change of focus direction. As I said with a Feathertouch microfocuser this jump decreased to maybe 1/9 of the field of view on a 13 mm eye piece. I ended up adding a Meade electron microfocuser to do fine focus adjustment when I am imaging - so I don't have to touch the OTA at all.
Good luck - dying to hear how this OTA works for you and what the views of Saturn, Jupiter etc look like!
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