Tom,
As a fellow A&P/IA now retired I take exception. I can advise owners about thing that should be done in the interest of keeping their plane in airworthy condition but under the regs I have no way to enforce that shirt of asking an inspector to confirm my judgement. I have only once had to do that when I found some countersunk rivets in the wings of a Cherokee Arrow. After fifteen minutes of looking the ASI hung a condition notice on the plane effectively grounding it. The plane was one of those fresh paint and interior and the nosegear trunion had scrape marks on it that indicated a nose gear up landing. No way in hell was I going to put my signature in the logs or let my purchaser but the plane even though he was smitten by paint and interior.
Bottom line was the previous IA who signed it off as airworthy lost his certificate. My right under the FAR's is higher priority than his.
Oh, yes, I have dealt with less than desirable customers. When they ask for an annual I am too busy to accommodate them.