I spoke to Phil Booth about this very thing, and he told me the standard servo horns are a VERY tight fit. This means people often seem to put one on that actually too loose.
Don't expect to be able to push it on then put the screw in, you'll need to use the screw to pull it onto the splines.
Once it's fitted on that tightly they don't slip. Not had a problem since doing it that way.
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