Most muffler clamps are oversized by 1/8 inch so I just use a 1-7/8 in. clamp which provides a perfect fit to 2 inch masts. de Tom N4KG -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com