I've found that we are too critical of our work and most people can't tell the difference when something isn't perfect. How many pairs of pants do you own that are perfect? Do your best and if he has a problem with it he got what he paid for. My son is a cop and he always needs his uniforms hemmed, either the pants or the long sleeved shirts. I will do the pants but not the shirts. He understands and pays someone for that. I don't do zippers so when he wanted a pair of old coveralls repaired with a 20 inch zipper I put in Velcro instead. He owns a farm and the animals don't care. He likes it so much better than a zipper. So we just do what we can!