the old cardew books, who didn't deal with accuracy, but on efficiency. They contend that minor deiseling is what gives a bit of a power boost to most springers, burning minute amounts of oil on each shot. Too much, of course, what we normally call dieseling.
On the lower power spring guns of the time, leather seals squeegeed the oil to be compressed, hence a 'mirror finish', while synthetic seals used tiny scratches in the cylinder wall to pick up oil in front of the sea.
So, on a higher power gun like that one, I don't really understand the thinking behind roughing it up either, as you can increase the dieseling just by using more or different lubricants. But, if you really want to, just get a hone at your auto parts store, as coarse as they have, chuck it into your drill, and hone away. Or, the coarse emerycloth with one end taped on a dowel, so the other end flaps the tube, again chuck it up and spin it.
Sometimes you find a cylinder with a substantial gouge in it, and you have to use the sandpaper method to smooth it out. Otherwise it may cut up your seal. But that is only to try to fix a problem thats already there.
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