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I'm not sure there is a replacement wear point on the magnet? I remodeled a 20' utility gooseneck for my dad several years back that was my first experience with electric brakes I replaced all four of the magnets because the brakes didn't work well and stopped uneven. When I got all of them pulled apart the old magnets were worn maybe 1/8" thinner than the new ones? The small spring on the back of the magnet was rusted and weak on a both axles on one side? If the spring is to weak it won't hold the magnet to the drum/armature. All of the shoes were thin but after seeing new ones they start out pretty thin! I adjusted all of them until they where dragging fairly hard. They seemed to work pretty well afterwards