I recently acquired an 1920ish 8x10 Improved Seneca, and am looking for info. F or the rise/fall controls on the front standard.... Is this some sort of lockin g control where the wheels and shaft have to have some freedom to move left or r ight in order to lock/unlock, or is it a friction arrangement? What diameter/th reads is the shaft the knobs screw onto? I think it is 8-32 thread and 1/8 inch diameter but have no micrometers for measuring it. I know someone willing to m ake a knob, but it would require dismantling the front assembly for him to measu re th shaft (I don't want to do that). Thanks to all.
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