Hmmmmmm Yes I guess so. Ive tried moving the pickup brushes closer. Wont work. Ive moved them so they touch also. Still wont work. When they are touching you do get some charge going in to the capacitor. Very little, but still a lot of arcing. The motor slows way down when it trying to charge the capacitor. There is a slight amount of charge tha is accumulated when they are touching.
One thing to note about the brushes, when you first put them in they may not seat down on the commutator correctly and may need to bed in so to speak. This would rsult in the brushes not being timed correctly.
My thoughts This may go against what you believe. But here goes.-----If you look at the picture you posted. The pole shoes that you can see. Look at the mounting hole it off center. What does this tell us. It tells me that one side of the pole shoe is longer on one side than the other. The lip I am talking about.---------If it were an even number of armature slots this wont happen. Because the pole shoe edges match the edged of the armature slots. this pretty much international standard. Now if it were an armature with an odd number of slots. that's what you would have to do to get the pole shoes to fit right. Usually odd numbers have more sots and the same number of bars which make it run faster. So you can cut your in put power way down because it running from the load side. So it wouldn't take much for this to self sustain itself.
Coils C and D plus I expect coil B to be as you describe. Its probably because it is easier to cut down one side than both to make narrower shoes.
As for the relationship between the number of slots on the armature and edges of the pole shoes, that is something I have no idea about so I cant confirm or deny anything on that.
Looking at the picture you posted. Brushes numbered 1-3. Can only be in that position if the armature is as the one they showed. Because the armature is wound with one set of windings for each side both in one slot groove. Then as it cross the armature to the other side on each side of the shaft there is 2 slots in between the windings. Which would put these 2 brushes in that position. This would take them off the neutral position and cause a kickback spark using DC.
SOME more experimenting has to be done on this yet.
Because there is some interference from having both 1-3 brushes like I have them now.
Im not sure what you mean but thinking out loud is good.
If 180 degrees is thru center of a circle. 180 deg north 180 deg south. 90 degrees east-90 degrees west. Divides it in 4ths. Then the main case slot would be at 180 degrees north. That leaves the slot in the bottom of the case at about 190-195 degrees. Taking up more of the circumference on the A-D side. Which puts the main power brush close to the bottom slot or over on pole shoe c. That brush is number 2. If it rotates ccw. Leaving no. 4 as the pickup brush.
No more of the circumference is on the BC side. This is to get maximum distance between B and C allowing them to remain either side of the powered coil on the armature.
Was working just with the A-D coil side today to try figure somethings out. Looks like no2 and 4 brush are just about 180 degrees from each other. No 2 brush can be moved to top dead center of coil d and still spins fine either way. with quite a lot of speed.
With the brushes in place now there isn't much room to put in no. 3 brush. So will have to refine it tomorrow.
Brushes 1 and 2 are set at 180 degrees as are brushes 3 and 4