Universal Vacuum PAD [with .stl & Fusion 360 files] 

Fusion 360 File:
goo.gl/Mz2PxZ
Vacuum cleaner Adapter
Fusion 360 File:
goo.gl/9Cdcrs
STL File:
goo.gl/wcSpJD
O-Ring 37.5 x 3.55mmm
Lux & Co. GmbH:
6mm EPDM moosgumi round cord
eBay:
900 mbar vacuum pump ZW 280F compressor piston pump
aliexpress.com:
BSPT PC8-02, 8mm to 1/4' Pneumatic Connectors male straight one-touch fittings