i bought the trickflow spring kit and my machinist didn't like the shims that came with the kit. he said they don't fit snug and would bounce around to much. the ones that came off it were a press on deal with part of it up around the valve guide piece. anyone know where i could find them or something that fits better than the tfs ones? he can't get em in the small quantity that i need, and the local ford dealer doesn't have em.