Sorry about the pics, this is my first effort and Ive tried to make them as small as poss.\r\n\r\nI knocked one up last night, a damper that is. Bit hasty and no doubt can be done neater but its very simple;\r\n\r\n[IMG]http://i5.photobucket.com/albums/y157/Sanchez001/tube-ring1.jpg[/IMG]\r\n\r\nI use copper wire to form the centre, the wire I have been using is 2.5mm think and was stripped out of some wire at work used for three phase. The is from a 16 amp rated cable. I wrap it round something of a similar size (in my case a battery) and cut it so it form a circle. It doesnt matter if its not perfect at the moment. You could always solder the two ends but I like to leave as they are, you can beef up the ptfe abit more as theres abit of expansion. One word of caution, the thicker the copper you use the hotter the damper will get, copper is a dam fine conductor.\r\n\r\n[IMG]http://i5.photobucket.com/albums/y157/Sanchez001/tube-ring2.jpg[/IMG]\r\n\r\nNext its a case of wrapping the ptfe round, this pic shows me balls it up coz I went round the wrong way, clockwise is the way to wrap. Just keep building it up till its a tight fit. Do this when the tubes are cold coz tubes expand slightly when warm.\r\n\r\n[IMG]http://i5.photobucket.com/albums/y157/Sanchez001/tube-varnish.jpg[/IMG]\r\n\r\nWhen youve got a tight fit, finish the ends of with a dab of nail varnish, Im a rimmel man myself :D \r\n\r\n[IMG]http://i5.photobucket.com/albums/y157/Sanchez001/tube-ring.jpg[/IMG]\r\n\r\nNot a great pic but this shows you it in place. If you've got a good, tight fit it doesnt take long for the ring to fit perfectly with tube and you'll find a perfect centre when you take them off.