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So, in order to make your lid fit your bowl just perfectly it's important to use a tool
called a caliper. And you're going to need two pair in order to do any kind of lid fitting
properly. The first thing you want to do, these calipers can be opened this way or they
can crisscross each other to go this way. And when you take the interior measurement
of something you want to have them crisscrossed like this. Now you want to hold your calipers
directly over the center line of your piece so that you're getting the maximum diameter
measurement. And you're just going to adjust your calipers and hold them over the piece
until the corners of the calipers touch just at the very top of your lid gallery. You want
that widest measurement. And once you've got a measurement that you're happy with you take
this first pair of calipers and you line the second pair of calipers up touching the edges
of the first pair of calipers so that your measurement is this way because you're going
to measure the outside of your lid rather than the inside. And now we're read to throw
the lid.