I did drill it out. I finally got the third one to work.
Reminder: it only takes a smear of supper glue. the excess glue will get on the contact and ruin the light.
Also: The compression part of the knock has to be very tight. if not the light will break loose from the upper end of the knock and slide down your arrow shaft on impact. If this accures then you have to remove the insert and use a gun cleaning rod to push the light back out....