If it's a galvanised tank, you'll need a grinder and there's a huge chance with the sparks from the grinder you set something on fire. We leave them always now!
Could a nibbler work?
Edited to make sense
@Grumpy_Git started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
If it's a galvanised tank, you'll need a grinder and there's a huge chance with the sparks from the grinder you set something on fire. We leave them always now!