Place a couple dish towels or other soft materials on the base to protect it from any potential impact.

Disconnect the planetary from the motor drive shaft by removing the retaining pin (circled in yellow). You can do this with a hammer and either a pin punch or a Torx T15 screwdriver. Simply hammer the punch/screwdriver on the pin until it comes out the other side.

If the planetary assembly doesn't fall out, you might have to give it a firm pull straight down to remove it.