Instructables

Aluminum Bottle Tumbler Cup & Cook Pot for an Alcohol Stove

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Step 8: Finish

Picture of Finish
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Again use the dowel to finish pressing the second roll tight against the can.

Adding just the start of a third flare, will help to close the gap between the sidewall and the second roll.

Stretch the rim by placing the dowel in the bottle and repeat the stirring motion. This will bring the rim back from any "out of round" bending that might have occurred.

The stretching also increases the "hoop tension" on the rolled rim to finish pulling it tight against the side wall.

The photos show the finished product with a tight fitting rim.
 
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