I just hate it when the guy behind the parts counter thinks he knows more than I do about my own work or projects.

One time I saw a MANAGER at a parts house tell a guy he didn't want a short reach plug like the used one he had in his hand, but instead should use a long reach plug. I pulled the guy aside and told him that if he used a long reach plug in a head designed for a short reach plug, that the engine would be destroyed the moment he started it. (The pistons would have smacked the plugs.) Could have been a real unhappy ending if I hadn't overheard their conversation and intervened.

AV8TOR