all you stone point users, do you have to resharpen you heads after shooting them in practice or to test arrow flight before a hunt? I always wondered how yall did it, i knap my flint on my smokepole, and lose a lot of the size, and it would seem after all the work to make a good flying point, it would be a shame to reknap for sharpness. so what do you do? or do they not dull unless they chip? thanks, would like to try it but need info first.