Interesting technique. Hopefully it worked. That inner metal is tough to cut aroundA thought occurs to me...
When I had to remove the inner bushes where the rubber was worn out on an old car suspension, I just put a bolt and nut on it, tight, an impact socket on the bolt head and spun it until the rubber finished disintegrating.
That let me get it out and then I could use the Sawzall blade to cut the outer shell and punch it out.
Saved me using a torch near a very leaky car fuel situation.
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