With an air vane governor you still need the spring from the throttle cable plate to the throttle butterfly don't you? Otherwise how do you set desired revs? I have air vane set ups amongst the pile and they have this spring, which is the one I assume is missing from the first pic.
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If I'm not confusing various optional set ups and you want this spring, $5 including postage in a padded envelope. PM me if you do.