heal quick mick,used to use oxy,set the flame,strangle the oxy hose ,shove it in the bunged up pipe,& light the mix,bingo,(if you got it right
) presto dents were gone,went a bit far one day,opened up a green strip GR pipe with a bang,flat as a lizard drinking ;
ps not good week for mechanics,guy up here roadtesting customers bike ,woman turned across his bow(didn't see him officer),took his foot off at the ankle!