quote; I want to get a good diagnosis on it, so when I call the repairman I can point to what needs fixed so he doesn't spent more time than needed searching for the problem.
IF he is a "good" door repair mechanic, he DOESN'T need you to tell him how to fix it. AND, there may be a completely different problem than you think you have, regardless of YOUR diagnosis. Tell him what is happening and let him do the diagnosis. IF you tell him what you want done and he does ONLY that, you are going to be unhappy if the problem happens again in a short time and might say it is his fault for not fixing the REAL problem. In my business, I seldom, if ever, listen to what the customer says is the SOLUTION/repair and just ask him/her what the PROBLEM is. Then I find the source of the problem and fix it.