All you do is drop it on and turn the knob.
So far the only "whole" sight I've found is a new in the wrapper one.
If I can find a slide cap screw and a hinge pin I can put one of the used ones together.
I even found an odd one in a drawer. The leaf is either zinc or aluminum.
The prices will run $30 +postage for a nice used one and $50+ postage for the new in wrapper one
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