Kono3inch,

Dicksons probably never made a ribles DRA, but they could accomodate special demands within reason. Many years ago they had quoted me for a non engraved, non checkered, non ejector.

Ribless would mean less work in fitting ribs, but some extra work in making and fitting special packings.

Having seen the rust accumulation when ribs come loose, and the hassle it is to relay ribs, I detest them.