Negotiated Module

I went to Cornwall for the weekend to stay with my family and play with the grandchildren.  My son and I discussed my project and he has not only suggested using dowel (we tried out some samples and I think he is right) but also gave me some 20lb transparent fishing line and showed me how to tie a Uni Knot to secure.  As I promptly forgot he found me a great website - www.animatedknots.com so I can refer back to it.