Jonathon sorry, bit late to help with the picture for this morning, but if I've understood you correctly you seem to be talking about a mechanical power press that is usually operated by a heavy flywheel?
I'm sure someone will correct me if I'm wrong but I think Sweeney & Blocksedge just made hand operated flypresses.
Power press tooling will usually have 4 guide pillars running in either plain or ball-bearing bushes in order to ensure alignment & die/punch clearance. In fact all sheet metal punching and forming dies need alignment & guidance, though some small die-sets such as those typically made by Danly
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only run on 2 guide pillars. As Lionel has already mentioned, simple forming on a flypress can be done using the Hunton universal bolster system, into which different dies and punchs can be fitted into a single base. These aren't usually guided on the tool as far as I know.
We run a number of small cropping and forming punch tooling in small Danly die sets in benchtop Hare-press type pneumatic toggle machines. I can take some pictures of these if you like and mail them over tomorrow, if you still need them.
To make a large hole without a punch and die you need flame or laser or water jet cutting, or a drill, file, and a lot of patience:)
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