Not what you asked for, but it's just as easy or easier to buy wedge top frames, pop the wedge out, turn it 90 degrees then staple glue it back into place.
Here's a video with me showing and discussing this.
For a comb guide I attach a triangle of wood (cut at 45 degrees from a 1/2" thick board) to the underside of the top bar between where the end bars meet the top bar. Another option is to glue a strip of wood into a slot cut in the top bar to act as a comb guide.
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