Mechanical innovation is not unknown in Bolton - Vernon Kaye's Reciprocating Mouse Sprocket immediately comes to mind. Though the area is well known to local historians, through maps and deeds, there are no accounts of flour mills ever. Just the placename inference that there was a Saxon fulling mill on the riverbank (about a hundred yards from where tuesday grew up), which is a quarter mile downhill from where the fragment is now. When stones are being transported for walls and buildings, in the field, they are almost inevitably taken downhill. The invention of internal combustion changed that, of course.