Liquid elecrical tape and a toothpick. Carefully done, it's undetectable on pinholes. It works well. I can't stress enough the importance of covering the whole works with your dark cloth before pulling the slide. Even in 1894, in a book I have, it was stressed that covering is very important. Even with new equipment. A person can get by with a surprising number of little pinholes by taking this simple step.
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