Front sight removal from Winchester 1917

[Calfed]

I recently purchased a sporterized Winchester 1917. Part of the sporterizing involved grinding the front sight protective ears off.



I have purcahsed a front sight set from Springfield Sporters, but am having trouble getting the old sight off.

I removed the pin and front sight insert--no problem. The sight base and what remains of the front sight ring are stuck fast. I placed the barrel down on a 2x4, had my son hold it and banged away with a hammer and brass punch to no avail.

Any ideas?

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