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This is an original product manufactured for Jet. Note: I use a similar bracket on my own Cabinet Maker's Table Saw Rip Fence.
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This is Jet number JTAS10-146 left hand thread worm gear for the Xacta table saws.
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This is Jet number JTAS10DX-146 right hand thread worm gear for the Xacta table saws.
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This is the spanner nut used on the arbor assembly of the Jet 10" Xacta saws.
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