pipe bending
http://www.cornwallmodelboats.co.uk/cgi-bin/sh000029.pl?REFPAGE=http%3a%2f%2fwww%2ecornwallmodelboats%2eco%2euk%2findex%2ehtml&WD=tube%20bender&PN=hand_power_tools%2ehtml%23aP5536560#aP5536560
£4:54 I have a set and for what I needed they worked fine.
Sir Terence David John "Terry" Pratchett, OBE (28 April 1948 - 12 March 2015)