Right now, it's a bit too large because the key is missing a button knob that affixes to the left most lever on it's right side - like a typical Vibroplex. The mounting hole was drilled and tapped for a smaller screw than the one that fits the button.
Since this part is missing, the fingers have to travel a greater distance, I estimate the distance for "dash oscillation" will be right when I get the replacements I ordered from Mr. Begali.
73
DR