I never have heard about a Reedy BK motor before but I think at this time I was more interested in Trinity or HPI based motors.
And made a couple of conversions for my own needs.
Do you have pics for that special armature? And what timeframe was this?
Well I´m asking this for a reason.
First, I think Reedy gave up on using wraps on commercial available armatures at some point. Maybe different for team motors.
Second, and I might open a can of worms here. There was a single motor builder who wound special armatures for other teams as well, for making his living. Especially for Worlds, Euros or similar high class events. This guy told me at some point, but it might be not known to the public and maybe should not. At least back in the days.
And if that armature looks very neat and different to what is usual for Reedy, it´s quite possible it´s one of the armatures I mentioned.
I definitely don´t what to speak bad on Mike Reedy because I meet him a couple of times and think he was a great guy. Also I own a special Reedy made team motor. But I never have seen a Reedy armature what looks that neat wound or overall made as some other certain ones.
But that doesn´t mean a not so neat wound or made armature will be slow.
Regarding Mustang motors, this is quite difficult. Actually I meet the Italian team several times but there was always a big secret about the motors.
Actually I knew one of the Italian guys quite well, but I never was able to get such motor.
It is new to me there have been Igarashi based Mustang motors, because Igarashi cans were a lot of more work involved compared to Yokomos.
Also when the Euros started the Igarashis actually were gone.
I also never have seen a Mustang motor using slot brushes. But maybe they were made for 1/12 scale.
Regarding Sping, this is another mystery. Yes they made some very special motors and I would like to own one of theirs Modified. Same for the early Trinity slotted can motors. But I don´t believe the Trinity can actually was a Sping. Yes they look very similar made and the Sping picture unfortunately isn´t that detailed. But if you enlarge the picture, you can see the Sping and Trinity can doesn´t have the same number of slots.
BTW the Sping modular endbell looks a lot like a Checkpoint to me. I mean not similar, I think it´s a Checkpoint.
It´s very interesting you´re showing that Trinity ad by MIH (Modell Import Hamburg).
Because the owner of MIH was a Double European Champion in slot racing.
And he made a motor what looks similar to the Trinity can but goes even a step further than the Checkpoint. Because it is based on an Igarashi, uses the machined and slotted similar to the Trinity but larger slots. And came with a slot brush setup, not build into an Igarashi endbell but got a completely new endbell. The brush setup was located outside of the endbell as found with the Yokomo or other new style motors.
It is the motor I mentioned above.
I have seen exactly one sample of such motor in reality, now at my collection.
I try to find that motor in my boxes and show later.