Sometimes there is so much pressure
on the foam (from the thread) that
it will cut through the foam and
make the fly come apart, and the thread
unwinds. I don't like to use foam
on small ants for this reason.
Just one bite from a fish can be enough
to make the fly "pop apart".

For larger hoppers, I do not seem to
have as much of a problem.

My 2 cents worth.

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**MW**