I believe that the 2/4 mins adapter was sold by Edison also as a "retrofit" for older machines, so somehow I figured that there must be out there some surviving "banner decal" Home phonographs adapted back then for 2/4 mins cylinders.
However, it's been such a long time since I began searching for one of those, that I am now wondering if it really is so. I've seen all kinds of Edison Phonagraphs, Home(s) included, able to play 2 and 4 mins. cylinders, and I think all kinds of "Home" models (B, C, D...) EXCEPT a type "A" ("banner" decal) Home model WITH a 2/4 mins adapter. And now that I think about it, I don't really know if the 2/4 mins adapter could be mounted also on early Home machines.
Am I perhaps looking for a match of features that never existed?