bridged transfer ports

Kansas John /
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So I've been looking at some different cylinders, and at my new kit cylinder, and I noticed something. Occasionally, transfer ports bridged in kit cylinders, like so:

or like the top transfer on this kit

or on this Gilardoni

Anyway, my point is, these bridges are pretty much directly in the way of mixture flow. In most of these castings, these bridges are rounded off at best. I was showing my kit cylinder to a friend of mine who used to race 2 stroke Bultacos back in the day, and he suggested knife-edging those port bridges with some hand files to minimize turbulence. Is this worth taking the time and effort to do, or is it another one of those 200 little things that you can do that provide no measurable performance benefit? Does anybody else do this to their bridged transfer ports (I already did it, but haven't installed yet)?

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