Anybody have a handle on the Flues top levers? My 1915-vintage No. 1 Special 28-gauge has a toplever and spindle forged in one piece, no screw. I have noticed some Flues have a screw in the top lever, but never took the time to study whether they were early or late, or what gauges. Unfortunately the only picture I have of my Flues in Photobucket doesn't show the top lever --
Also, the 28-gauge Flues models I've handled only have the single bite in the rib extension, not the two bites of the larger gauge Flues.