Thanks for the tips guys.
So to measure "out of round" would I measure the diameter from top to bottom, left to right, and then diagonally and they should all be the same?
As for a "bear hug" is this literally just squeezing the lid?
My binder clips were 2 inches wide and I heard 1.5 inches is fine so not sure the issue there.
Thanks again.
Bear Hug Procedure...
1) Take the lid and place it on a table, upside down (the lid, not the table !)
2) With a tape measure, measure straight across the diameter in several places.
If the lid is round, you will get the same reading every time.
3) If not, mark the widest area (piece of tape)
5) Place an old towel (or similar) on the table
6) Place the lid on the towel with the wide dimension in a vertical orientation
7) Press down
8 ) Check dimensions
9) Rinse and repeat as is necessary
This procedure is intuitive.
Excuse the multi-step dissertation.