Hi,
use softtape by 3M. it is available in diameter of 6 mm (1/4 inch), 13 mm (1/2 inch) and 19 mm (3/4 inch). 13 and 19 mm are self adhesiv!
look here, it is German but the pictures are speaking......
http://www.rc-network.de/cgi-bin/bei...;f=51;t=000004
or here:
http://www.rc-network.de/magazin/art...2-0003-00.html