I dont recomend glueing in nocks.

make sure the back of the arrow does not have any tiny cracks, bend and twist listen for any noise.

An easy fix if the arrow is ok is get a plastic baggie put over the end of the shaft then press the nock back in, strip the plastic baggie down, there will be some plastic left around the nock just get a lighter and heat shrink the plastic.

Thats what I do to all my uni bushings and nocks.