Well, now! I just got an object lesson in just how much knitting tension (at least for me) is affected by which hand feeds the yarn. Wow. My grandmother gave me a pretty little doily she knitted, plus the (hand written!) pattern she used, for Christmas. I was giving it a try last night, starting by feeding with my left hand. Two sections later I changed to my right (thinking, "oh, yes, this is how I do it!"). Two more sections and I am staring at it is dismay. My left is very much looser than my right.
Now, I need to decide which of the two tensions I want to use for this. Left makes it lacy, right makes it dense (the pattern actually says it supposed to be a round dish cloth). It's pretty quick... maybe I will do both.