Gbojar....I am not sure from your posts if you make the coil before hand and thread the silica through it or you wrap the coil around the silica directly. I'll just tell you how I do it and hopefully it will help you out. Get a 3/32inch (2.4mm) drill bit and wrap you coils around that. Then make a U with 3 inches of 2mm silica....get 6 inches of any wire and thread it between the U. put the two ends of the wire together and thread through the coil you just made. Finally, pull the ends of the wire and this will move the silica towards and then through the coil. Cut off one of the tails of the silica and your done. Hope this made sense.