Dan,
I think that I can help you out, if you have yet to solve the problem. I posted an album of the complete disassembly of a Lewis model and am currently finishing up a guide to the entire process.
As for your Top Lever assembly (see photos):
Once you've removed the top lever pin (the threaded pin that affixes the top lever to the cam) you will need to find a pin punch that fits into the tapped hole on top of the cam. Strike the cam downward just enough for the square post to clear the top lever and the top lever will slide out to the rear.
Then, from the underside of the receiver, punch out the cam TOWARD THE TOP. ***Don't try to continue punching the cam down through the bottom of the receiver. It is meant to be punched down just enough to clear the top lever, that is all.***
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