On Burney I fitted a gearbox that later turned out to be one for a 16H.
It was NOS and I was happy.
But..a 16H type is meant for left hand mounting and as a consequense it turned the 'wrong' way for a W/NG.
So until I found/bought a correct one I took out the cable and had many happy miles oblivious from any exsisting speed limitations !
Few months ago I found out that the complete gear + cover plate has gone AWOL because it pushed itself out as a result of the different running direction.
Another lesson learned.
This is my next 'new' one. maybe I just keep it on my desk to gaze and pamper.