axle block bolt broke off in swingarm

Theres a 2008 kx250f on Craigs list that has the axle block bolt (that the nut to tighten chain is on) broke off into the swing arm where in screws in at. How can i get it out or what how much would it cost to hav a mechanic fix it?

I have spent anywhere from 1/2 to 4 hours repairing one. It all depends on how it comes out. The 4 hour fix was on a kx.....poor design, hard to get at. If you can't get it out, slot it and screw it into the swing will be money ahead. I had to cut the swingarm to get the bolt out and weld it up, re tap and mill it back to profile. The bolt was rusted on the would have never come out.

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