This is the way I went with the eyepiece heaters and pretty close to their instructions....
http://www.dewbuster.com/heaters/heaters.html
http://www3sympatico.ca/mark.kaye/dewheat.htm
instead of stitching the fabric I used strips of an old wet suit (again, that I got from a garage sale) and used spray glue!
The pad is for the secondary mirror.