Here's some photos of a single sheet holder I made out of plastic. I don't remember what plastic I used, but I don't think it should matter.
It measures 6"x4.5", and the sheet is held in place by nylon screws and nuts. I get really good development, and the sheet stays in place as long as I don't get too excited with the agitation.
The holes were drilled with a special bit designed for drilling plastics. The bit allowed me to make holes without chipping the edges. The plastic sheet was cut at the store (Tap Plastics).
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