Tony
I should be clear that I have not used the Colwood system. I do have the
Razertip. It was developed for the high intensity use of professional
bird carvers who burn for hours at a time as they define the quills of a
bird's feathers. In theory one can get 120 lines to the inch using the
standard tip. I am not in that theory but I can get a fine line. The
systems are available with 10 amp, 45 watt power supplies, line and
fixed tip hand piece at
http://www.leevalley.com/wood/page.a... 41115%2C45497
watch for line wrap.
or at http://www.razertip.com/razertip.htm
for all the information.

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God bless and safe turning
Darrell Feltmate
Truro, NS, Canada
http://www.roundthewoods.com