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And here is detail of the plate for holding the counterweights. It only required two screws to hold it in place because all of the force is vertical, and since the plate overhangs its supports there is a pivot, so the screws had to be close in to hold that end of the plate DOWN.
Additional screws to hold down the plate are neither required, nor desirable. When pulling the parallelogram apart and putting it together, it's useful to be able to spread the beams apart slightly to make it easier to position the washers. If I'd put in more screws as I'd originally planned to this degree of freedom would have been lost and reassembly would be much harder.
The dowel is from the end of an old broom, I drilled the plate half way through with a spade bit and then drilled up into the dowel from below and fastened it with a wood screw.
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