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The one that i just sold was modified by welding a linkage, ie, a piece of steel bar with a hole drilled in it, to the carriage at the front of the machine. I then fixed a piece of coarse threaded rod between the two front corners of the machine, but first strengthened the corners with a steel bar up each one on the inside. these two steel bars were drilled to take a flanged bush which acted as a thrust bearing for the threaded rod. The rod was turned down at each end, 1 to pass thru the bushes and create a shoulder to bear against them and 2 to create something to attach a handle to. The coarse thread has a free running nut with another small bit of steel bar welded to the nut with a hole thru. A third bit of steel bar with a hole thru both ends connects the first two and creates a linkage so that when the threaded rod is turned it bears against the bushes and makes the nut move back and forth which pushes or pulls the carriage. Mine was made on a suck it and see basis but was very solid and precise and was easy once i found a place to weld a bracket to the carriage. Maybe if the chap who bought is still on the forum he could provide some pics. Regards Andy