So, to start, sorry for my bad english. I hope that you understad what I try to explain.
Sometimes, you will need to change the weels bearing, because they do not work the same as before, so the same those from the brushless. I was searching on the internet how to extract them, but I didn’t found any video or something that explain how to do it. Then the few things I’ve found, they used an bearings extractor ( something that you find to buy) But I wanted something easy, fast and withouth buying any strange tool.
I’ll not show you how to open the motor. there are dozens of videos and even here on the web you can find some good tutorials
To start, try to protect your motor. I covered it with tape.
The tools that I used are:
a hammer,
2 equal pieces of wood
1 different piece of wood
iron wire
1 metal screw that need to be as large as the hole of the bearing, with a flat head and bottom
and the most important, the new bearing 
so I had 3 bearings to change: 1 big in the front, and 2 small one on the other side ( I use a enertion motor)
I started by bending the iron wire like in the foto
place the wire where you have just 1 bearing because it was easyer to get out that one, and face it down on top of the 2 equal pieces of wood ( like in the photo). So I’m using a screw that has the same diameter of the bearing but; because of that wire on the other side the screw ill stop os the top of the bearing. Some of you may ask why i don’t bend the screw a bit and hit directly the bearing. Because I may damage the bearing enclosure because it will not get out straight.
Then I hit a few times and the bearing pops out.
Now, for the other side, don’t lay the motor on the coper wires because you will need to use again the hammer and you may dammage it. instead, use again the 2 pieces of wood like in the photo (see that the motor didn’t tuch the table)
then use the screw head that showld be large enought, and hit hard 
Now to put the new one, use anothe piece of wood to cover the bearing so you don’t hit directly with tha hammer, or you may damage it
The job is done!!! That’s the way I do it, and never had any problem.
And I want to use this topic to show my diy Looooong long longboard, entirely made by me. (1 meter and 10 cm long )
2 4S lipo HV turnigy battery 1 vesc 1 r-spec 6374 1 e-switch from alienpowersystem 1 wireless hand controller from alienpowersystem 2 double basher truck longboard from gullwing sidewinder II 100mm wheels from mtb all terrain (the green one) and block pad raiser. that’s all
Hope that it will be usefull to someone