14-02-2021, 10:22 AM
Dave M I think we used hydraulic nuts such as Pilgrim nuts to provide the stretch and sometimes hollow bolts with steam heating through the bore in order to expand the bolt. This was in the steel rolling mill industry where some bolts were 6" diameter and occasionally larger. Sounds more sophisticated than strong men on the end of a pole. This was a long time ago and memory unreliable (according to my missis!)