The commercial tools are just a tube with slots and
sliders, with variable
friction. Almost trivial to make your own (as I did in High School),
although a well machined one will be a joy to use.
As such, sometimes just sliding that into the lock (WITH THE RIGHT AMOUNT OF
TORQUE) will get each pin to stop when it aligns.
I had one of those tools and it ran about $70. You had to buy a separate
one for each size and pin count. Could add up. It was all pretty tight
size wise, machining it would be possible if you precision tools but I
don't think you could make one easily with a dremel grinding wheel or
anything.
I was trying to talk a friend into starting a website where you could
order tubular keys cut by robot by number but he didn't seem interested.
*shrug*
--
: Ethan O'Toole