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Mounting DRO on Bridgeport J1 head 1978

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Hi guys,
I am trying to figure out what is the size of the bolt hole on Bridgeport (from 1978) ram that is used for eye hook to lift it up. I would like to make aluminum support for the arm of Newall DRO and bolt it to the top of the ram. I do not want to drill holes in the casting of the column.
Any help will be greatly appreciated.
Letlevski.

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