I wrote:

Make your cuts on the pipe very clean,
square and true. If you can get to it with a copper tubing cutter, come
down on it very very slowly, giving each tightening a few turns of the
cutter afterwards to insure it has cut to its maximum depth. Crunching too
far at one time causes deformation or crushing, and then the Shark Bites
won't work.
Steve

Please let me rewrite this. When using a tubing cutter, of the kind that
has a wheel you tighten to make the blade come in contact with the tubing, I
meant to write COME DOWN VERY SLOWLY ON THE WHEEL THAT MAKES THE CUTTER
BLADE ADVANCE. Get the cutter on the tubing, and tighten it only tight
enough to make contact. Then tighten it about half a turn and swing the
cutter around about three times in a three sixty. Avoid the impulse to give
it any back and forth action, but make complete circles. When you feel the
resistance fade, the blade has cut as deep as it is going to. Then tighten
up the cutter again just to snug, and repeat with three or four full turns,
feeling for when it has cut its maximum depth. Repeat this until it cuts,
avoiding the impulse to increase the number of turns on the cutting blade
tightener when you think it is about to finish cutting. LET IT CUT UNTIL
FINISHED, DOING JUST A LITTLE AT A TIME. Whether you are using Shark bites,
compression fittings, sweating, whatever, you will end up with a piece of
pipe that will fit better, and need minimal inside reaming or cleaning. Do
it slowly, just a little at a time.

There, that's better.

Steve