Hi Johannes, I have since had the press successfully rethreaded to accept the current RCBS Cowboy dies for brass 12g Shotgun cases. Using a roll crimper off the press I suspect it would also be feasible to do ordinary plastic and paper hulls.
The only way to "restore" it now to use original dies would be to rebore it to a larger diameter and thread that hole to accept a sleeve itself threaded internally to accept whatever die desired. Much like some contemporary RCBS and Lee offering are done with a removable sleeve to allow use of 1 1/4 in dies such as 50 BMG and the Cowboy 12g dies.
I purchased the press in ChCh from a TM auction. Tge big issue with restoring it would be finding original dies to complete a full set. Cheers, J.
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