Hi, Marv!

Again...your last writing is correct (mathematically), but that is not the same as what you wrote
in your first statement. Keep your eyes on "thickness (mm)" is not equal to "thickness * 10 in millimeters", isn't it?
Also IMHO it is not done to use centimeters and millimeters in one equation if pure math is concerned as well as
all mesurements should use an equal number of digits behind the decimal point.

If I'm totally wrong I will still admire all of your articles in this forum!

Pse all of you members keep healthy!
Yours
Günter ( sri for any misspelling because learning english has been many moons ago as I've got more than 70 windings on my spool)