[quote=arch]i've used 'bolt extractors' successfully a few times on car engines and it worked great. the hard part is drilling into the center of the bolt since the drill bit tends to slip around as you're drilling. since your bolt was tight enough to shear off in the first place, use some penetrating oil on the threads first and let it sit for an hour until the oil works it's way down into the threads before attempting to unscrew it. then take it slow.
if this method fails and you have to resort to drilling the bolt out, you can restore the threads with 'fix-a-thred' by alcoa or any helicoil thread repair product. i've had to use this a couple of times and it's quite effective. i used 3/8-16 size with a 13/32" drill bit. my bolts were 3/8".
http://afs-fix.com/fix-a-thred/04.htm
https://www.youtube.com/watch?v=b96y5It50Yo
good luck!
j<!-- editby --><em>Edited by arch on Feb 23, 2016 - 09:38 AM.</em><!-- end editby --> [/quote]
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