not to beat the dead horse… Tubs’ calculations are correct. 4/10 of 1% is 0.004. But. look again at the post in question, it shows 0.04% or 4/100 of 1% = 0.0004 ( for a 1 inch piston)
So, It looks like the “wesco” post just had the got the decimal point in the wrong place…typo!
Joe B
