wolverine question

Just a quick question. The square tubing turned on a corner that is used for the sliding base on a Wolverine sharpening system that has the stop that either the arm of the jig or the butt of a tool fits into, is that 3/4" square tubing(outside dimension flat to flat) or what? While I am asking, anyone have one handy to measure distance across the tubing corner to corner diagonally?

Thanks for any assistance, still whittling on sharpening systems!

Hu
 
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