This what I would try. Leaving it in could result in rust ruining your runner.
Originally Posted by
Tartan
I would find which way the pin was facing and back it off with my fingers until the ball was at a seam. I would see if the ball would fit through the space between the stitches and pull/push it out. If it is under the batt, I would wiggle it through the batt and out through the seam. If the seam is to tight, I would clip a stitch and take out enough of the stitching that I could tie off the ends, remove the pin and hand stitch the opening closed. It would drive me crazy knowing it was in there!