Unique 49++ Tighten Moen Faucet. Mine got loose from the sink and it was a pain to figure out how to tighten it. Fixing loose moen faucet dome cover. How do you tighten a moen bathtub faucet handle? I can get some turn on the lock nut with needle nose vice grips but not enough to completely hold it in place. Tighten Moen Faucet - Moen Kitchen Faucet Has Loose Cover How To Fix Handle Is Still Working It S Just The Handle Cover That Is Loose And Won T Push Back In Fixit Most moen faucets have a cartridge inside that controls the flow of water as it turns.