Roller bolt

the bar in a carriage to which the traces are attached; a whiffletree.

See also: Roller

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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I cut the roller bolt slightly short so it wouldn't drag on the side plate.
Enhancements to the power series I stoning fixture: these simple shop-made add-ons can make an excellent tool even better, faster, and more versatile
So different have the two halves of the the last two campaigns been that they resemble two cut-and-shut motors with half a Roller bolted on the back of a Reliant Robin.
Football: WE MUST STOP BEING A TEAM OF T WO HALVES David says United need to shine for a full season; DUNDEE v DUNDEE UTD

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