Wadkin Parr 4 Sided Planner Thickness Table Adjustment

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Hi I was hoping someone will be able to help/guide on how to setup/adjust the thicknesser table on a Wadkin Parr. The thickness table is set via a single handwheel that moves 4 acme threaded spindles at each corner which in turn moves the table up and down. The information I require is how to set these up so that the table moves vertically up and down and at the same time produces Parallel work.

Any information would be gratefully received.

Mark Jenkins