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convert a tire inflator-type air compressor into a vacuum pump

Step 7Make a hole in the case for the vacuum hose

make a hole in the case for the vacuum hose
I made a hole in the top of the case to run the hose through.

This was easy, since the hole I wanted was at the seam between the halves of the case. I just used nippers to make roughly semicircular holes at each of the mating edges, so that they'd make a roughly round hole when put together.
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Author:drcrash
I'm a research scientist who likes to design and build things, especially cheap, elegant tools for building things you wouldn't have thought you could make yourself.