Join Date: Oct 2006
Location: on the boat - Chesapeake
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Re: The WTF challenge!
Heating up the remnants and letting them cool will help break the connection which is likely corrosion welded.
Someone (Popular Mechanics magazine perhaps?) did a comparison of penetrating oils. As I recall PB Blaster was the best commercial product but the 50/50 mix of ATF and acetone Christian suggested was better yet.
Hitting the stud with a hammer also helps to break the corrosion bond. Since you said you have access to the bottom you might try also beating the screws from that side with a hammer and a brass drift.
After all that ViseGrips (tm) might get them out. If not you choose between welding on a bolt head (as suggested above) or EZ-Outs (which aren't easy).
sail fast and eat well, dave
beware "cut and paste" sailors.
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Last edited by SVAuspicious; 08-15-2014 at 02:44 PM.