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Heat it up with a soldering iron down near where it enters the fitting. No need to get real hot (not hot enough to to burn the wood) but a bit hot to touch. That usually works for me when it comes to metal fitting and wood.
Jim
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Joined: Feb 2011
I am sure some of you folks are scratching your head and wondering what the heck I am talking about. I removed the frog and it is clear that it is a bolt and that it threads into the frog only.
I was able to finally remove the bolt, but it will not go in any deeper than it was originally- not enough to snug up the level cap.
The threads on the bolt look good and it does go back in easily up to a point- then it binds. I guess that the threads in the frog could be corroded near the bottom, but this plane has no rust anywhere.
I will soak the frog in citric acid for a while and see whats happens.