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What I do to get the boss off is lay it on a hard metal surface (I use my vice) put the nut back on the (Just in case I miss) and then pound it with a hammer.
I would think most experienced members would use that technique.

I would like to make this observation from personal experience.
Being part of a large engineering shop as a young lad made me
observe the techniques used by tradies.

We avoided the laying of the Victa bosses on fixed hard surfaces.
Instead, we used the BIG hammer / small hammer approach.

Gadge has said pullers are not a good solution here, and this must
be related to what I experienced.

By using a BIG hammer as support, and using a smaller hammer (regular size)
as the hitter, I noticed tapers would be 'released' in about two strikes.
The 'shock' was transferred through both hammers.

When hitting against a fixed object, like a vice, I noticed this would take
longer! I think this means the shock (wave) 'broke the taper' more readily,
and the BIG hammer / small hammer method supplied this more effectively.

I understand most folk will have a vice and an engineering hammer.
Most will not have what we had - a large selection of equipment.

It's just an observation.

All very stubborn boss.
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Jack