Before removing the chain, loosen any front sprocket nut(s) by putting the bike in gear while applying the rear brake....to prevent the sprocket from spinning as you are removing its hardware. Aids in front sprocket removal.
Then simply grind the peened over edges flat on the master link and employ your breaker.
OPTIONAL ... as the worn chain is headed to the recycling bin anyway, utilize a disc type cutting tool (electric or air driven) and cut through a connecting link anywhere.
Takes all of about 15 seconds.
Good luck with it.
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