Hey again!
A few months ago I scored something that no other enthusiast has owned yet (to my knowledge); a Sparks Withington Model 35! It's essentially something very similar to a Federal Model D or my Interstate Machines Model F (even sharing the same chopper size!), with notable differences. Here are some images and a video of it below!
Here are some pictures of the disassembly. Unfortunately, I had to go back to college, so the restoration hasn't happened yet. The siren was cleaned out (the rotor had a BUNCH of cotton or whatever in it...from wherever it served in Florida...)
Shroud parts removed, not showing the base
Motor/chopper core...I wasn't able to figure out how to disconnect the motor; it seems it's a solid cast piece or something!
Sparton Core compared with my Interstate Core
Finally, Here's a video of it running. I seated the brushes after reassembly, and she SCREAMS even higher now!
https://www.youtube.com/watch?v=cZIxbGNeasg
Enjoy!