According to info given in "L C Smith, Plans and Specifications" for the FW both the hinge pin & it's dowel were made of 1020 steel. The hinge pin had a taper of ¼" per foot.
For the R hinge pin simply called for "Soft steel" with a taper of .018" per Inch. It's dowel was made of "Tool steel".
I would "Presume"; The hinge was driven in tight, hole drilled & reamed through knuckle & pinned. All ends would have been finished to contour, engraved (dependant upon grade) & casehardened installed in frame.
Perhaps the slight difference in taper was from different time frames & both types were made with both tapers, don't know.
Perhaps early ones were untapered, don't know, never took one out.
