A replacement "blade support" or hinge for the Opal & Saphire clipper. Basically the metal piece that inserts into your blade to hold it on. The springs can become loose, it can get worn down, especially if under load(not oiling blades, blades tension too tight=friction,) This will cause vibration and noise. regular maintenance is to change out the blade drive often(depends on how much you use your clipper and under what type of load. and check the blade support as well. 

Videos show replacing the Blade lever(drive) and support(hinge). Northern Tails video explains how to prevent issues with cordless clippers especially Opals. 

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