Our Re-enactment group were at Bolsover castle over the bank holiday. The carpenters wanted a holdfast or two. Pop to the next tent along, tell the blacksmith what you want and.......
That is impressive, built on the fly. I know that back in the day that Richard T went through a few revisions with regards to angles to get them correctly working.
They seem to work well, the pole lathe turner was using them al weekend and nothing moved under them. They have a leaf pattern on the head 'cause he could'