Greener also condemned the way his design was executed by many other makers. Like redoak stated above about his Francotte, the fit was not of a standard to be doing any real work.
I have three guns with the Greener cross bolt & one of them is a La Sorda (Spanish) that has had a new hinge pin fitted to tighten him up. Even though it brought the barrels back to face only by a matter of a few thou" nothing about the cross bolt operation or fit changed, it contacts on the bottom 1/8 of the rib extension hole.
The other two are British & one contacts on the bottom 1/4, while the other contacts the bottom to rear 1/2 of the hole.
So I suppose that they are doing something for lockup even though it is now claimed by some manufacturers that they are not needed due to metallurgical improvements & the strength of the Purdy double bite under bolt. As is the claim for all third bites & the reason why some new guns don't have them & rely totally on the under bolt.
I like the Purdy hidden third bite as it seems to add another wedging type latch that wedges over the top, in opposition to the under bolt.
The Greener cross bolt is more security in the psychological than the physical unless meticulously fitted.
O.M