Can't Loosen Collet Nut

Welcome to the forum on the back side of the photo you sent I think there is a lock button. It looks like you have your router disassembled If you push in the button and lightly tap on the wrench it may come loose.

thank you so much for the help, you guys were exactly right! I put the router back together turned it downwards about halfway right before the pin could be released and put my 15 wrench in and it came out nicely!



the image I took was after I loosened it, if someone reading this is trying to do the same thing just make sure you raise it so that pin is depressed so the cylinder cannot spin.

thank you for the advice about cleaning it after the lub, I will 100% do that and completely understand you.

Also I learned about these guide blocks, they are the black ones in the images below. They are put in the gold looking boxes that have springs that push them towards the cylinder. I was messing with them trying to figure out how to balance them so I can put the shaft back inside, and I realized I'm an idiot, put the shaft in first! then press these gold blocks holding the black blocks in there!

Just trying to remove the bottom bearing, I can hear it making scrapping noises. Before I try with a rubber mallet I figured it's worth a shot asking here thanks as always!

The brushes as you called "guide blocks" and the commutator on the amature second photo down look pretty rough. The commutator and brushes needs to be fairly smooth. You may find that it may not be worth it. Brushes are cheap but if you have to get the commutator turned it can get pricey they should look clean and bright otherwise the motor will not run properly.
If you take the armature to a motor shop sometimes a automotive machine shop Like some NAPA stores can turn them the are basically the same as the starter in your car. they can give you a quote for turning the commutator. But you may find it is just cheaper to buy a new router. Hope that helps you out.