Dom
I think in my last post I described why I think its not good practice to have edge ejectors on the shut off face as you described i.e. over time they can hob into the opposing half and damage its surface leading to flash.
Another alternative if you have a plate too thick to drill & ream 2.5mm through may be to cut a circular slot type pocket around the base of the core and fit a ring type insert. This need only be 10mm thick and then you can drill and ream the 2.5mm ejector holes in this. You might want to use the stepped type ejector pins for extra pin strength. They are the 'CN' type in the DMS catalogue.
Regards
Davy |