Resist the urge to hammer the steerer even with a sacrificial top cap
I learnt this the hard way. I think it should be fine with a rubber mallet though (plus the oil and hot water you mentioned)
Same here... ended up having to saw off the topcap and bit of steerer which were pretty the distortred and wedged in.
Another way is to use a heat set crown race setter, couple of knocks frees it and inertia will do the rest.
@coventry_eagle started
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I learnt this the hard way. I think it should be fine with a rubber mallet though (plus the oil and hot water you mentioned)