I would like a vacuum pump for repairs etc, is it better to build one from a fridge compressor or buy one off ebay. Ideally I would like it to be able to maintain a set vacuum automatically, so it would need to cut in and out. I guess either way some mods would be needed to either the bought or recycled option.

What do people use and how do they set them up, do you use a regulator to maintain pressure or just a bleed off valve, do you use a tank or chamber to act as a "buffer" for pressure and also capture moisture or resin. Hoping for some good advice or even some guidelines or instructions on how to set it up.