thanks snowy i have been wanting to know how to tie a d loop,
i still have one of those metal ones on. 
Great post Snowy.
Be careful with the metal d-loops. I have seen many a metal d-loop wear out the string underneath where it can not be seen until it breaks.
Im not saying they all do it but i have seen enough that I dont use them and I dont reccomend my customers use them either...
Bill