Inexpensive heavy dusty adjustable feet for table jig or bench

[Aussie48]

They might where you live Mate but not here in Australia floor levels are controlled by CCAA T49 CEMENT CONCRETE AND AGGREGATES AUSTRALIA 2003 which has a maximum allowance of slope or fall of 1/80th of the span. The floor in my workshop has a fall of 1 inch away from teh house and 1 inch towards the double roller door. It was either built before 1989 when the Standards were made Law or a dodgy one eyed contractor laid them.