So long as you can get the lid on and things dont lock up....go for it!
It's all about clearance Clarence.
Due to the design change from the lever style T-jet brush spring; the Mags and pancake Xcellerators, use a beefed up perch and a coil spring. The Super ll uses an actual guide. They are all susceptible to coil bind if you're not paying attention when shuffling different springs and brushes around.
If pressed, the early lever spring just bellies out below the chassis. They give. Conversely, due to the later re-inforced spring perches, the later style coil spring's travel is finite. The end result of compromising brush travel mashes the top armature shoulder into the bottom of the gear plate if ya get too pushy. Coil bind IS arm bind because the entire package moves in unison on the vertical axis. It's an inherent quirk of pancake style E-motors with horizontal comms. As you load tension into the comm springs you load equal tension into the opposing bearing surface.
The idea of calling arm bind "brakes" is one of those nonsensical slot car terms. It's not brakes... but it is like driving with the E-brake on at all times. (Just ask my wife....LOLOLOLOL) Irrespective of what comm spring design is used on a pancake, the turn of the trick is to find the maximum amount of spring pressue for good current path, but not so much that the upper arm journal becomes a grist mill.
Regardless of what combination you use, the armature must have some USEABLE end float. When assembled, the brush pack pushes the arm up and exposes the gear to plate clearance topside. After set-up, and prior to applying power; you should be able to finger poke the gear and feel the springs doing their job. Naturally with tighter gear to plate tolerances, and hot rod parts combinations you have to utilize some common sense.
All in all, a better mouse trap IMHO. Although there's less margin for error, it's pretty hard to screw one up unless your not checking your work.