"Alfred Hitchcock Presents" made its debut this day in 1955, featuring the portly master of mystery weaving tales of suspense and twisted endings. Our homes too are filled with lots of mysteries and "twisted endings" like those special waterline fittings under the sink called "compression nuts." Typically, these fittings connect the water supply to the faucet. Inexperienced folks often try to guess how much to tighten the nut on a compression fitting, with disastrous results. One can can easily overtighten a compression nut. To avoid this, use these easy-to-follow Carey Brothers' steps. First slide the nut onto the copper pipe, then the "ferrule" (the proverbial "brass ring"), then slide the pipe into the fitting as far as it will go. Tighten the nut by hand, then turn it only one more revolution with a wrench. Turn on the water and if it leaks, tighten a bit more -- gently -- until it stops. That solves the mystery of compression nuts, and just how much is enough. And that's the On The House tip for today.