Hi, I am having extreme problems Tying detached bodies, I am trying to tye a deer hair body for a Crane Fly, I tied it on a needle (all I have at the moment) and it all looked very nice, finished it off and varnished it, wait for the varnish to dry, then tried to pull it off the needle. All that happened is that the thread came undone, even though I had done a whip finish and a couple of half hitches, it just unwound all the way down the body

, can someone tell me how to tie these properly?
I hardly did any thread wraps on the needle itself, only 3 or 4 to initially attach the thread. I have attampted the body twice, both times the same thing happened, I did as few thread wraps as possible on the second attempt, but it still failed to work.
Any help appreciated