FIRST: Pound the threaded rod into the compression sleeve. 
This can take abuse without damaging anything. Then place it over the motor
shaft.....but...
 
 
DANGER: Do not pound on the motor shaft itself. You will push it into
the motor housing and damage the motor. Get someone to hold the shaft
as close to the motor housing with needle nose vise grips, or something
to take the pounding pressure. Put the pliers in a vise for additional
holding power if there is room. You just don't want to pound on the
motor shaft directly.