tightening alt pulley?

When I`ve had to remove/install them,I just went to a local shop I sometimes go to and they zapped it off and on for free with an impact wrench.

The alternator was off the car though.
 
I think the 2g alternators have a washer,mine did,but the 3g I got didn`t have a washer.

Impact wrench is the fastest/easiest way.

What did you hold the pulley with?
 
i used the old belt. but form looking at the shaft i see the threads are about an eighth of an inch away from the pulley. the nut just stops near the end of the threads. do you know how wide the spacer was?