The mouse with wine-bottle lead foil in the top may have been my fault. I did that to two of them--at home and in my office--because I found a little more pressure made the ball track better. I've never been an alcohol-consumer; the lead came from a friend, who used to save it (back in the 1980s) to mail to Republicans. Apparently he had, many years before, registered to vote in a Republican primary solely to oppose a particularly-poor candidate. That somehow got him on a GOP mailing list that sent him endless funding appeals with post-paid envelopes. He used to fill the envelopes with lead and drop them in the mail, in the hope that he would cost the party even more in excess postage than they were already spending to send the funding pitches. By the time I was at Bell Labs, he had moved to Canada, and was no longer receiving unwanted political funding pitches, but he was glad to save a few bits of lead for me when I thought of the trick and asked him. Only too glad, it turned out; he kept saving it and saving it and saving it even though I neither needed nor wanted any more. Eventually I managed to get the message through to him. He has since moved back to the US. He is still fond of wine. I don't know what he does with the cork wrappers. Norman Wilson Toronto ON