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Best not to attempt removal with a tool lacking a guide ring.

Without guide ring tool can shift under load damaging ears and rendering removal more difficult.

Here is the Bicycle Research tool from California. There are other brands of similar design. Back during "the boom" shops sold the Cyclo tool without guide ring for use in Regina removal. Not recommended. The Campag and the DuraAce tools also have the guide ring and are a good fit on these notched Regina gear block bodies.