Another bit of information,concerning the Walkers.The artist william Turner, came to Rotherham and Sketched aspects of the Walker Cannon works,in 1797.
Just found  a copy of his sketch online .Here it is,on the left could be a boring  tool of some sort.

Another turner sketch,showing the main bridge and church.

Walkers ironworks dominated this part of the Town.

Another turner sketch with the walker ironworks, this Time at Conisborough.
Conisborough castle can be clearly seen up on the hill,with the water wheel  that ran the boring tool in the
centre of the sketch.

Conisborough  castle shown in the sketch above,
214 years later.