Charlie+ wrote, on Tue, 30 Sep 2014 08:06:29 +0100:
These are good questions.
All I know is the difference in cutter is a few thousandths.
How many? Vic said he didn't know, but when I had pressed him, he said not more than 5 or 10 thousandths.
When I pressed him on how that would damage the bar with the thinner rails, he said that that's what they tell him.
So, I have had three (3) customer service personnel tell me the same thing - but not one of them can tell me why.