Aluminum Bottle Tumbler Cup & Cook Pot for an Alcohol Stove

Step 3 Start the Flare

The edge of the bottle needs to be rolled back on itself 2 times this tuck the sharp edge under the second roll and away from contact during sipping.

Start to flare the edge of the bottle. A 1" diameter wooden dowel works well.

Start by placing the dowel in the bottle so it is resting on the bottom. Rotate the dowel around the edge of the bottle.

Use a "stirring" motion as you press the dowel outward against the bottle's edge.

Gradually pull the dowel up off the bottom of the bottle while stirring to increase the angle of the bend.

Comments

[dpainter]

Is the end of the dowel, the end in the can, cut square or rounded?

[hpstoutharrow]

It is square cut. But, there is really nothing particularly critical about the dowel or its dimensions. The point is just to use something with a friendly surface to start the flare. A small diameter PVC pipe might also work. I just wouldn't use anything harsh like a steel pipe. Also something with a small diameter,like a pencil, might cause a crease in the flare edge given the small surface area, point contact.