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My very popular - 3 Sealed Bearings,

Extension Tubes and Instructions

Make a variety of different sized vacuum cups to be held with your 4 jaw chuck by turning a tenon on a dense hardwood block and common PVC couplers found in building centers and hardware stores.  Detailed step by step instructions included. Starter set of 'foamies', (the gasket between PVC and your workpiece, not shown) included.  

$24 + $5 pack/shipping 

FrugalVacuumChuck.com