Thanks for the Reply
The boat and I are in Turkey at the moment so it's tough to procure some of the wonder products you mentioned.
The bolt does not turn, frozen solid.
I've done sharp taps with a smaller hammer to help the penetrant work as well as big bangs with a larger hammer for encouragement and to relieve frustration.
I am definitely using TefGel on any fastener I remove from the mast... in fact anywhere I've got SS fasteners going into aluminum. I don't want to have to go through this again. Once I've overhauled the fasteners on the mast I plan to periodically ensure they can be loosened. I'd much rather do preventive maintnenance than repairs.
The cold propellant sounds interesting. It's difficult to direct the heat to a small area quickly.
Once again, thanks.
Greg
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