Take a 13mm 6pt socket and heat it up red hot with a map gas torch and knock it down onto the 14mm bolt head. Let it cool and try to break it loose like that. I've used this method before with success. Good Luck.
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.