Raising Serial Numbers

Q: I have an old pinball machine. Its serial number, stamped in the plywood, is scraped so that only the top of three of the six digits is readable. Is there some way to raise the numbers?

Andy Rae: Dampen the area with clean water – hot, warm or cold will work. Let the water soak into the wood, which will swell the crushed fibers in the stamped area. Bingo. You’ve won six numbers.

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