My 1945 Logan 200 lathe came with a Logan AC-210 Production Collet Closer (see attached). It's a push type that supposedly allows 5/8 through stock but some of the collets that came with the machine go up to 3/4. After fiddling quite a bit, the seller was able to demonstrate that it worked but it's still a mystery to me how it works, despite studying the somewhat blurry cross section drawing. The lever bolts to the bed and has a yoke with two ball bearings that engage a slot in the outer rotor housing. This allows the closer to loosen the collet and advance the stock without stopping the lathe. A rearward force on the housing moves the collet into place. Three internal pawls move the collet sleeve against two small coil springs in the outer housing but they have nowhere near enough force to clamp it tightly. I can see that a steady force on the lever could maintain the clamping force but the geometry doesn't seem to be an overcenter arrangement. Any idea how this works?