DIY: Vacuum pump - Make

I am working on a project where I need to create a vacuum. After searching the Internet I found this really nice solution. It most likely isn't as easy as

Make a Manual Vacuum Pump for Under $20 by Converting a Bicycle Pump : 8 Steps (with Pictures) - Instructables

DIY: Vacuum pump - Make

Homemade Vacuum Pump from syringes

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Homemade Vacuum Pump from syringes

DIY: Manual vacuum pump - Make

DIY Vacuum Purging Chamber

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DIY Vacuum Purging Chamber