MOTM

Thought I might offer up a possibly less expensive alternative. I use a 
little Greenlee model 1913 tool (although there are identical designs 
from other mfr's as well). You use a setscrew to set the minimum 
diameter, so once set you never have to worry about actually cutting 
the metal. Best of all: $6.20 from ACK Radio, my local electronics 
headshop.

e