The very first thing done by Professor  Frothinphome was to pour the Guinness out from the can and consume it. Thus fortified, he found the energy to proceed with the gruesome surgery ahead. First, the top of the Guinness can was reverently severed from the venerable cylinder of the can, using the sacrificial Sacred Can Opener (one must treat anything Guinness with its due respect, one must!).  The can was then swiftly, yet reverently inverted over a towel. When the can was removed, all that remained was the legendary Widget.

The Widget, as it turns out, is little more than a 30 mm diameter sphere.  A very obvious symmetry exists between the two hemispheres, suggesting that it is made from one, one-size-fits-all hemisphere, heat bonded to another. There are six clamping surfaces, three on each hemisphere, opposing each other. This is how the hemispheres are fixtured for the heat bonding process which makes the sphere from the two. There is a cylinder molded into each hemisphere, slightly off the center axis.  The sprue, the site where the molten plastic is injected into the mold during manufacturing, is just across the center axis from the cylinder.

The opposite hemisphere, shown at right is almost identical to the opposite side--almost! Note the pinhole in the cylinder above. That is the mechanism by which this whole thing works! They must somehow pierce the hole after assembling the sphere. Could Guinness be playing with lasers? Lasers and alcohol don't mix, folks. There's a story there. Remind me to tell ou about it some day...

In this view, we can see the clamping surfaces and the rather heavy flash line where the parts are joined. Professor Frothinphome will bet you a beer that these parts are simply heated to melting along their edge, then pressed together to form the sphere.

Ah! But now it is time to subject our friend, once again ,to the knife--or, in this case, the bandsaw! Opening our little diving bell, we see the interior of the sphere. There was a small quantity of beer in it when it was opened by the saw. Note the identical formations inside each hemisphere. Only one, though , has the tiny pinhole which causes our beloved Pub Draught affect.