Thanks! I got it! But instead of pliers, which would have been the easy way, I braced the camera with my thighs... Stupid, I know. The pain... :[
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Let me tell you what a solid beast you have. Some years back, I was entering Wrigley Field, Chicago, for my baseball pilgramage to that hallowed site. I had my photosniper--without shoulder stock--in a partially zipped up rucksack. It dropped out, fell at least four feet, onto a concrete floor. It landed on the top body cover, as the front of the film advance. When I finally got to my seat, after cleansing the tears (vbg) I thought I would FORCE the film advance, since I may never get back to Wrigley Field--and, so what the heck.
With some effort, the film advance functioned. I shot my film. It was perfect. When I returned home, I took it to my repair man, who bad-mouthed my Zenit. I told him it had functioned after what had happened. He pulled it apart, straighted a bent shaft on the film advance--apologized for not being able to get the frame counter working; but also said that the camera was now otherwise completely functional. It has been that way for, perhaps, ten years now. Try that with anything else. And, as I said, the lens is suprisingly sharp.
Good shooting--but don't take it to sensitive political gatherings with it on the shoulder stock. You might be set upon by the forces of law, order, motherhood and the flag.