Hi, I'm re-entering the hobby. When I stopped it was still brushed motors with Nimh batteries, so lots to learn.

I've started by taking apart the used cars that I bought as well as the BL motor in one of them as everything was filled with carpet residue.
Obviously it took longer than planned to start the rebuild of the motor, so I'm not entirely sure anymore how everything fit together.
I've tried looking for the motor on the web, but it's an old one and not much to be found (GM Dr. Speed with a silver can, could be #97259, #97262, #97267, #97277, #972)

Questions I have currently:
1. When I took everything apart, I sprayed the inside of the can (and tried to clean it with some cotton swabs) and the rotor with brake cleaner and left it to dry out (I don't have an air blaster). Was this a good idea? I got the tip from somewhere on this forum (been reading so much I wouldn't know where I found it anymore) --> apparently no, compressed air only
2. Is it important how I insert the rotor before closing it? As there is a blue mark on it and I did not see that when disassembling it. There is a blue mark on the can (endbell?) as well, I believe this is to know/adjust timing. I left that in the position it was. I tried to line both (rotor vs can) up but there's no match there. --> stupid question I guess since the rotor spins anyway
3. where does the shim/spacer thing go? Does something need to line up with something here? --> only one place it would fit
4. should/can I replace the bearings? I took them out and blasted them with brake cleaner. I have Hudy bearing oil that I can apply to them, but one of them feels/sounds very gritty. How can I tell if they have the right quality as I suspect this requires higher strenght than bearings used in wheels? Before you start posting any links to stores, I'm in Europe..
5. on the outside, there is no mention of the windings/turns (not sure if those words are used for brushless, but hope you know what I mean), any way I can tell?
6. the plastic on the endbell is cracked, but I don't think this is a big problem as long as it stays on?
7. should I loctite the screws (i think so) or lube (don' think so) anything else?
8. when I unsoldered the wires, something came off the welding tabs, you'll see what I mean in the pictures. Will this be a problem? Should I try to glue it back on before soldering the wires back?

Want to upload some pictures, but not a premium member yet (how many posts do you need for this?).
Appreciate any help to any of the questions!

Stijn