Large collet chuck or spindle or arbor or ???

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Subject: Large collet chuck or spindle or arbor or ???
Item for sale is (1) item that is a guesser for me. I have no idea what this is.
I believe this is a collet chuck off of a grinding machine of some sort. The head pivots and there is a degreed scale for precision.
One end of the spindle is larger then the other, approx 2-3/4" tapering to 1-3/4" over a 4" run. The overall length of the spindle is 10"
The spindle spins freely without binding.
Please feel free to ask questions on this item.
Item is USED but in NICE SHAPE.
On Jan-18-07 at 15:33:50 PST, seller added the following information:
I have just found out that this item is an attachment for a Cincinatti Surface grinder.


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