I made mine from a plastic For Sale sign. I grabbed the image Adam was kind enough to post here, scaled it to fit the outside of my dew shield, printed it, taped it on the back of the plastic sign and with the help of a straight edge and a razor blade cut out all the parts.
I went with the thin plastic sign as I knew all those cuts would be a chore and I wanted it to cut easy. After it was all cut up it was much more flimsy than I had anticipated. That was fixed by using Popsicle sticks and a glue gun. As a testimony to the wide tolerances of the design, one of the popsicle sticks blocks most of one of the openings. I had some old plastic window blind parts that act as angle bars I glue gunned on with some black felt that hold the mask to the dew shield. It works great as long as the scope is pointed up. Luckily for my design, that is where most of the stars are.
I didn't worry about the size or spacing. I just scaled Adams image to fit my scope. The details of this design aren't that important I think as mine worked flawlessly as advertised. $2.50 for a For Sale sign and 30 minutes of my time and, vola a highly precision focusing instrument.
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