gRF wrote:Try
http://www.astiquer.com/ - just to see what kind of contraption/device the guy devised for aircon servicing

wow, quite impressed with the above website, with the prices all listed out, would visit his office / workshop soon.
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I have seen another guy do a presentation once and was impressed, and have always recommended him to my clients for about 1 year plus now, if they ask for a recommendation and i have gotten no complains so far.
His name is Kenneth, HP is 96945525.
another guy is Philip, HP 91017111 - i know he has a lot of expat clients, a nice spoken guy who calls me up, if his clients have other problems.