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I have found over my life that if I do invest in the special tool to do it right.... as compared to paying someone who may or may not do it right.. .that I almost always use the tool again at some time...
Perhaps you could farm out ... under your close supervision... just the pressure leak test... then go forth and finish the job... that would usually involve two times ..one to find the leak...one to make sure it was fixed ... and does not cover the fact that you do not have a way to capture what you have in the system AND clean it...
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