I have worked in the industry and the only guy I would use in Calgary is Quinton 519-1394 he is independent, mobile and has a lifetime warranty on his work.
If you have not been here you are missing out. Its the little shack beside the home food inn on Mcleod and the beef dips are epic.Great service and unreal food.
http://www.urbanspoon.com/r/15/1484735/res...f-Shack-Calgary