Hi John, the holder with the long screw is similar to one that I have, see my post in Flickr:
https://www.flickr.com/photos/49367257@N07/32762529907/in/album-72157704319705802/It is a custom Monotype design to hold Ludlow matrices. If that is the case then you need to look around for the mould base and insets:
https://www.flickr.com/photos/49367257@N07/27825308724/in/album-72157679622222388/I have also attached a picture on this site, photo by Jason Dewinetz.
If not a Ludlow holder, this is a case of Monotype making something custom for a company.
I think it is not really appreciated, however, Monotype was very good at creating engineering solutions.
They just didn't keep good records about it, and now, of course, most records are gone.
The holder on the left in the box appears to be a composition head holder, but more pictures would be needed to confirm.
Do you have a comp head for the Super Caster?
Dan Jones
Pygment Press
