My foreman told me the always use two sets of feeler blades method,one old feeler gauge, cant believe it would make a noticeable difference ? i have seen those "sets" with the little tabs used on the youtube vids but didnt think it was mandatory. how would it better the outcome ?
edit..... just seen the advert for the feeler blades at moto works along with the explanation of why to use them, every day is a school day.
Telling me that the arm rocking on the shaft could give incorrect clearances when the engine is hot
you are basically eliminating all the possibilities