When repairing thin lines (such as a car or refrigerator), it would be good to have on hand a small pipe cutter, and for connection of pipes with swivel nuts — device for rolling. Not hurt in a home workshop and a small vise. All of these devices can be made in the form of a set of interchangeable tool based on a simple clamp of suitable size (or specially manufactured). The design will need slight modification for mounting of tools for different purposes. In the first place must be milled afterwards the groove under all replacement fixtures (cage support rollers, rolling, vise) and drill a hole for the stopper.
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