They have a nut that should secure them to the white bracket. The problem is I can't tighten it - I've tried 3 pairs of needle nose pliers but the pliers grab the threaded shank before it can tighten the nut. There is also no access to tightening from the sides. Also, do not latch the Comm Elec cover. So avoid them and you won't waste your money on a useless product, which of course comes from China. Return these.
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