My father bought a Wicked Ridge Invader Crossbow with the Wicked Ridge Bolts. He wanted to take out the flat nocks and replace them with lighted nocks. He tried to pull them out with pliers and didn't have any luck and we then tried to heat them up which deformed the nock but it did eventually come out. It seemed pretty difficult to remove the factory nock. Can the factory nocks be replaced and if so what is the easiest way to remove them. Heating them up didn't work as well as I thought it would but maybe it is the only way. Any advice would be appreciated. Thanks.