InglewoodMost people's portfolios have gone up since October but few have doubled in my thinking.I have no doubt that your fear of margin is real and has probably led to many sleepless nights and stressful days.I don't know what a short investing career that you mentioned means , 5 years here or there but possibly you should consider whether the risks are greater than the rewards , never mind the stress and take your profit , forget margin and take the advice of an old Slogan from the firm of Smith Barney, : We just don't make money , We Earn it.: One day margin will come back to bite you as if it always worked , then everyone would be using it.Good luck and cheers Inglewood.