For others who have a tripod missing this lever: I found that a standard radio knob (designed to fit a 1/4" shaft) will fit if you drill out its brass insert to 9/32" and use a hacksaw to chop of about 1/2" of the shaft on the tripod (this ruins the shaft for using the original lever, but parts are no longer available, so I chose a working tripod over an original one missing parts.). The knob now works to tighten and loosen the clamp just fine. Go easy with is as it is now missing the 1/2 turn limiter.