Swing arm bolts.. Muahaha! Evil things if they haven't been removed..
You need something you can use to get a good solid perch on the bolt that is around the same size and that will spread the load without mushrooming the end of it. Then you need to pick your hammer. If its not working lube up again and get a bigger hammer.
My last one was a WR450F and it was in there good and proper. Took about 4 days of lubing and hitting but it came good under the gentle persuision of a sledge hammer. You'll get there!
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