The B011 the 0 normally indicates a taper shaft motor.
I noticed in the 'Other' board you asked about changing the encoder on a redcap, they are keyed and secured by a 5 or 6mm Allen head screw down the centre, they take a bit of a twisting to get it off the taper, but usually very easy.
They can be replaced on the key either way as they are 8 pole motors so the encoder works in either position.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.