[GreenKeys] Motor gear questions

[John Nagle]

This is for Dave Rabinowitz, who is trying to get a Model 15 going.
He's having motor gearset problems, with a broken gear.

His machine has these gears.

74505 PINION (7 teeth) on the motor shaft, which meshes with
74151 GEAR (35 teeth) [the broken one]

That matches this Teletype manual:

http://aetherltd.com/public/model15manuals/1110B_Model15_Parts_Dec43_ArmyVer.pdf

That's an Army manual. Not sure what speed those gears are for.
They only list one option, so that was apparently the Army
standard.

Here's a list, from a ham sales company, in 1971, that
has all the gears:

https://www.navy-radio.com/manuals/tty/W2DLT-1971.pdf

That shows the 74912/74913 pair for 60-speed machines,
which is what I've read elsewhere.
Nothing in that table matches the Army manual.

So, 1) does anybody know what speed the 75505/74151 pair
runs at, and what's the situation on getting replacement
gear pairs?

			John Nagle