I think he is refering to the adjustment on the fence - where the said slot is perpendicular to the fence....I think. I see the merit in his endevour.
Another option might be to use racks in the slots and then a common axle for two pinions to act against the racks. By turning the pinions, it would move both sides equally and maintain parallelism. The rack could be the guiding, perhaps. Locking could be accomplished with either an expanding wedge arrangement of some sort inside the slots (built onto the racks) or a compression collar on the axle - like a motorcycle triple clamp gripping a fork tube.
Just an idea.
Gotta run - sorry to be so brief! Gotta catch a plane!
Scott
Scott
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