M_Boats: masthead strain relief

In an earlier posting to my electrical installation question,it was strongly suggested that I use a strain relief device at the Masthead to hold the electrical wiring and the coax for the antenna. I went to an electrical store and asked for the strain relief device they would use to attach a cable to a pole. The only thing they offered was a basket strain relief with an electrical box connector on the end. I can figure out a way to use it but there must be something made for the task. What is it called and where would I find it? Thanks Doug Kelch "Seas the Day" __________________________________________________ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com