Fellow Coilers.......... I have just finished winding my first "magnet wire" secondary coil. It is a 6" acrylic form (.125 wall), and 28" long. Before I begun winding, I laid down Scotch #665 double sided tape. It is 1/2 inch wide,and I left a gap of 1/8 inch between strips. Hope this will be of some use to you............. Tom Renko......The Amp Man...