Remove the nock and drop a 3/16" drill bit inside the shaft. Start with the bit on the nock end and with a swinging motion sling the bit into the insert. It takes a few swings to get the rhythm, but once you get the bit smacking into the back of the insert it will slowly work its way out. Only use this method with factory aluminum inserts. I've tried this with brass inserts, but because of the mass of the brass the bit just deforms the end of the insert and makes it even harder to get out. Good luck!