This is the steel collar that fits over the shaft at the end of the top or bottom bevel, its purpose being to contain the Oldham Coupling that fits into the tang at the end of the bevel gear shaft.
This version is one thou (0.001") undersize on original fit, as the original shafts can vary fractionally with wear and usage. Price is Each.
Ideally the collar should be a 'nip' fit over the shaft, where it is lightly tapped on (I use an alloy drift with hammer, with the bevel gear bottom face sitting on an alloy/wood block).
For the lower bevel gear this also seems to serve a second function, in that it stops the lower bevel gear dropping through gravity onto the crankshaft bevel gear. Not sure if this was Norton's original intention (or actually if it makes any significant difference!), but for this reason, I always try and make the collar a nip fit on the shaft.
Because there seems to have been a considerable variation of SOHC Bevel Gear shaft diameter variation (i have seen up to 1.5 thou variation on the quite considerable number of gears I have measured - even unworn shafts). This particular item is an alternative to item 0460, it being approximately one (1) thousandth of an inch tighter on the shaft than 0460 - i..e. ideal for bevel gears with a nominal diameter of 0.7475" - 0.748" or less. if the collar is too tight - you can carefully 'flapwheel' the inside diameter of the collar, until it taps on, or, if too lose - use a small quantity of 'Bearing Fit' to retain the collar. Note: If you think your shaft is a greater diameter than above, then item 0460 may be better - or if unsure buy one of each!
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