Replacement Parts for SISP21.
The steel extraction plate fits in the main body of SISP21 to extract the pinions. It is designed to allow extraction even if the pinions are located very close to the motor case without causing any damage to it.
The counter bushing has two very important functions:
To center the double shaft motor perfectly by means of the axle housing hole.
To keep all thos motors that are not equipped with the double shaft centered, and at the same time, safeguard the inner bushing of those 'long can' motors that do not have an axle stub protruding from the can.