Models: 514, 518, 520, 5142, 5182, 5202, 7518, 7519, 7536, 7537, 7538, 7539, 75182, 75192, 75362, 75372,What is the bolt pattern where the sub-base mounts to the aluminum base?

The bolt pattern in the aluminum base is: 4 holes, tapped 5/16"-18,  equally spaced around a 5.75" (5 3/4 inch), diameter bolt circle.







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