I know that the a good service tech would have 3/8", 7/16", 1/2", and 9/16" wrenches in his bag... Would anybody add to that... Does anybody use a regular combination wrench to remove carrier service valve (king valves) stem covers?... Does anybody use a wrench to remove the caps on pump down valves?.... I use nutdrivers for 11/32", 3/8", and 7/16" for blower wheel mounts, and was considering using a 1/2" for compressor mounts, does anybody else do that?... OR do people have a small and a large adjustable wrench do it all? Or the least best option, a pair of channellocks?