Thanks for all the info Searcher. I was able to pull it back from the top about 20 degrees or so, and when I did that, all kinds of gunk came out, plus alot of black stuff which looked like it might have been dissolved rubber. I don't know whether anyone has ever opened the can; I've lived at the house for 10 years and I certainly never have... who knows what shape that thing is in. Anyway, I will give the rubber mallet a shot when I get home this evening. Thanks again!!
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