In regards to creating a vacuum pump at the top of the pipe,
- Make our own vacuum pump out of pvc pipe (there are how-to videos)
- Convert a bicycle tire pump into a vacuum pump (there are how-to videos)
- Purchase a vacuum pump
- would be most accurate, most expensive, but least time consuming
- I found one for a little less than $40
- It has a control valve to hold the vacuum in place
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