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Thats pretty slick..




Gerry, if you decide to use a Greenlee punch set, I'd use a Uni-bit to drill the required hole for the arbor...and you could also generate a hole using a small "hand" Greenlee, that requires a 3/8" dia starting hole, then you use the "hand" Greenlee to open up a hole for the arbor shaft on the hyd unit



FYI...Greenlee's are also available to make square and rectangular and oval holes in sheetmetal