Convert Belkin FM Transmitter from Battery Power to Car Power

Step 7 Cut hole to accomodate power cable

Once you've tested it, use a dremel or drill to cut a hole in the end of your transmitter casing that is slightly smaller than the cable that will be running through it. You want this to be really tight so it holds the cable in place with tension from the casing screws instead of having to glue it in place (but you can if you want). The easiest way to get this hole right is to put the pieces of the casing back together and then drill the hole at the seam.