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How to Remove a Dent From Wood
I have that same one and sucked in a plastic pail lol, are you using metal? Does that top hose go to the vacuum or the wand?
I applaud your efforts but this is not a good instructable. It's not a matter of being afraid to make this device, it's that you are giving people very bad advice. Once I was hard up and bastardised a car charger to run off a 3s lipo. There are smarter ways to make a power bank.
This is such a bad idea, I would not plug into a phone. There are modules for this on aliexpress for about $2 and they have protection built onto the circuit.
How to Grow Popcorn Shoots
Organized Drill Bit Drawer