Here is some Revolt 120 porn for you:
Armature diameter 112.13mm. 12 teeth; 45mm X 26.1mm, Looks like wound with 5 wires of 20ga.. Phases 120° apart, Phase wires 10Ga Silicone.
Laminations are .5mm thick, 90 of them:
The gaps between the teeth seem a little too tight to fit a hall sensor between them
(assuming that is electrically correct) without dangerous grinding. Assuming that one could practically mount the halls inside the motor, you would have to pull out the phase wires and enlarge the holes a bit, drill some new holes or use REAL thin gauge wire... The thinnest insulated wire I have handy is 26ga, and even with some prying I couldn't get it through te existing holes
.....
The large bearing between the motor mount ring and the housing is 58mm OD, 45mmID and 7mm thick.
The shaft bearings are 60002Z (we already know that the shaft on the 120 is 15mm Dia.
There are 14 magnets, 50.85mm X 45mm. (One of them slid out when I pulled out the armature.. have since glued it back where it belongs.
The motor housing / magnet carrier is 125mm diameter, just a tad under 5 inches, and 90mm / 3 5/8 inches wide.
The end plates are 6.0mm thick on the motor mount end, and 6.20 mm thick on the other end.
They are secured by 6X each of 3mm allen head bolts 7.33mm OAL.
These small bolts are pretty soft, are 'loctited' in pretty well
(one was crossthreaded too.), and even with Kroil seeping in for a few hours, and a judicious application of a heat gun, one on each end stripped out and required cutting a slot with a cutoff disk for a regular screwdriver to remove, and the cross threaded one needed vice grips too.
This is the first time I've touched an outrunner motor, so it took a while for me to even figure out how it worked, mechanically.
I foolishly thought that the rotor was locked, the bearings bad, or a foreign object blocking rotation, until i accidentally figured out that the only thing that you can turn by hand is the motor mount, until you mount it, then the whole motor and the shaft spins when mounted properly.
Let me know if there are any questions, while it is still apart