Step 10Cut the hole in the top of the tank
The first thing to go is the handle/valve protection collar around the top. With a marker pen draw around the inside of the ring and continue the line in an arc across the gap.
Cut the ring at the tabs flush with the top of the bottle and grind of any remaining weld material. Trim the bottom of the collar to remove the remains of the tabs.
Cut a circular disc of steel out of the top with an angle grinder or a gas axe if you have one.
While you've got the angle grinder out remove the paint on both sides of the collar and around the lip of the hole you've just cut to prepare it for welding.
Save the resulting disc to use for the bottom ventilation ring.
Now you can weld the collar back onto the tank so that it surrounds the hole.
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