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Paranoid no, but I will freely admit to being extremely cynical and with good reason.
I have a few trusted suppliers, people that have been introduced and recommended to me etc. but if I was to walk into a shop randomly off the street, I'm not just going to trust the guy. I know from experience, he'll sell me an engine and tell me it's good. If it's not good, he'll give me another no questions asked and again tell me it's good. He doesn't care about my lost time fitting and removing it, he's just happy he got a sale. If I put an engine together myself and it's wrong, then I know it's my fault but I have 100% faith in my own work.