well, it appears to be like an ancient chinese secret beyond the disassembly you and i have already learned how to do i did a big search for ao smith motor disassembly given how most pool pumps use those but nothing beyond how to do what we've done..i took the back cap off my spare motor to check it out and my guess is you remove the end screw off the hub there and take all the electrical part out and maybe there's something under there to unscrew that "base" out..once in there, it's just getting at the armature. i don't think from what i recall when i took my front end all apart, that i saw any screws on that impeller end of the motor. oh, the good news? i've been searching high and low for the screw for the switch i took off my spare motor to mount it..found it