Just acquired a used shaper. Getting familiar with ins and out before I start using it. Began looking at various suppliers that sell shaper knives and I see that some of them are designed to be run with finished side down and some with finished side up. In the router table world I'm familiar with it's always finished side down. Is there some simple reason I'm missing for the variance in shaper knives?
Also, who is your favorite and most cost effective supplier of choice?
Thanks in advance for your ideas!