sorry folks, in all answers I detect a strong desire to sound smart rather than to help, please read again my question where I ask: "how"
I know this will get me in trouble but let's see:
-The Bearing on a trim bit is a fence on the bit no less no more.. ( I said: other than flush trimming bit )
-Now that is an interesting perspective!
-Very perceptive, BJ.
-BJ has nailed it in as few words as possible. I like it.
honestly, all those answers don't do much for my "how" question. If you don't agree please don't start an argument that would get us nowhere, just disregard this message but I would appreciate very much any answer that would actually help me.
as always, thank you in advance