My machinist is just the opposite.If I have any questions he will double and even triple check it.He spent like 2 hours just checking the keepers and springs on my new Stealth heads even though I wasnt going to use them.He just wanted to do it for his own knowledge.A good machinist is priceless.That and his prices are super reasonable.Some Ohio guys here know him and all say the same thing .He is one of the best.Rocky