Using the pinch method is not a very efficient way of getting the best out of your links.
You not only deform the plastic, but you weaken it a bit and cause inevitable future slop and sometimes premature failure.
I learned years back how the helicopter guys actually friction bore them using an extra pivot ball fixed into a drill.
The trick is to not spin it overly fast, as to not melt the plastic, but rather not overly slow as to not heat up at all. When you do it right it will feel warm to the touch and will perfectly and symmetrically wear down like silk with no slop or binding possible after. Inherently as it was actually bore-sized with the ball intended for use.
You can add a few drops of graphite or some from a pencil and spin it in there after you bore it to have even more slickness.
Maybe I will make a video demonstrating the process sometime.
Last edited by Josh L; 04-02-2015 at 12:56 PM.