I have thought that a "Greener" cross bolt was a round (in cross section) crossbolt that protruded from the action when the action was open, and If the crossbolt was square in cross section, then it was a "Scott" cross bolt. Either of these could also be tapered to "wear in", and i am not certain if the same names apply then. I have not thought these names to apply to crossbolts that did not protrude from the action when the action was open