While reading all of this, I would have to say that the observations are, by and large correct, and confusion always abounds when it comes to terminology. Depending just how "old school" the machinist was back in the day, several techniques were used, many having been developed working on Model T & A Fords (and other), sometimes rather "hammer-fisted"! More than likely, spiral guide liners were fitted by your description. Knurling the outer diameter of the guides was often employed on "loose " guides to tighten them up in the head... GEESH! A side note from the very dim dark past: I can remember having a set of new guides and tappet blocks "rifled" ( as in a gun barrel) by a local gunsmith on my Dragbike back in the day. The thought was to improve oiling and performance! I can't say it did or didn't improve oiling at this point, but I remember everything that was really fast smoked (alot) back then...anyway!. The debate about the necessity of valve seals continues to this day!