I think PP rents a "SirTools" crimper, which IMO, is junk. The OE dealer crimp tool (made by Iwis, the chain manufacturer) is a fantastic tool but very expensive - $400-$600 for the whole setup (it's sold in separate pieces). The OE tool has jaws that press the center plate into place (some aftermarket master links have a slip-fit center plate, but the OE links are a press fit). And the OE tool will press the outer side plate in place, before you rotate the jaw and crimp it. Let us know how it turns out!
BTW - my chain stretch went from 4 degrees to zero with the new chain in a 603, at ~240kmi.
