There is a knob on the right hand side at the bottom of the chassis that the head rides on. That is to lock the head in position. However with enough force on the crank you might be able to override it, but do not!!!
For my stand, I just have a sheet of 5/8" (15mm?) thick plywood with a plastic counter top type to finish it for the easel stage. The stand is a metal fabrication that I got from a late friend many years ago.
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