Really? I'm no expert on cylinders, but thought all cylinders played with a flat-bottomed stylus, the grooves being more like troughs, with the modulation being in the bottom surface rather than the groove walls. i don't think you ever want to play a cylinder with a pointed stylus made for flat records. Best, John Haley On Fri, Dec 18, 2015 at 9:13 PM, Rob Lomas <[log in to unmask]> wrote: > Edison factory blueprints show the 4 minute stylus as 3.5 mil conical. > > -Rob > www.edisonia.com > > > On 12/18/15 8:15 PM, Overkill wrote: > >> I have been wanting to build myself an Archeophone for playing the common >> Amberol type 4 Minute Cylinders. I want to use a moving magnet cartridge >> and I am looking for suggestions as to which cartridge and needle size is >> best suited to fit the grooves correctly?? >> >> >> >> Dave >> >