Brush and motor gallery

Now I realize this will be for a very limited audience, if anyone, but here's a a bit of brush gallery of my TTL-200C motors. The measurements are obviously metric.

What the heck. Here's a couple more shots of the motors themselves.

They're about 8 inches in diameter and they don't have an internal fan so an electric blower must be added. Perhaps the converted turbocharger thing Jack sells on EVTV store or something like it. As you can see in the background of some of the pictures the motors came with shrouds which had a hole for a blower, but the shrouds were at the wrong end of the motor (not the commutator end as they should be) so they will need a bit of modification to fit the correct end. That's because the commutator end is partially blocked by the plastic box which covers the wiring.

By the way there are four poles in that plastic box with two of them connect by a copper bar. That's all well and understandable for a series motor, but when I got the motors the other one had three wires coming out. One in A1, one on the copper bar connecting A2 and D1 and the third on D2 (I'm trying to remember the markings right). I wonder what the mystery third wire is for if they really are series wound. It does say SERIES MOTOR on the nameplate. I heard that the motors they ended up using in the Elcat EVs were actually compound motors which would have three wires, but why are they here? Could you use the third wire for some sort of regen without hurting the brushes? Let me know if you have an idea. I'll have to take some measurements to make sure these aren't really compound or SepEx motors too, but I doubt it very much at this point. Most likely the third wire is a mistake of some sort.