I got one of the old WWII Pentac lenses today, the 8-inch f2.9. I'm having difficulty removing the flange, it will thread off a few turns (with some difficulty) and then seems to be stuck. There was a small screw in the barrel that looks like it might have been intended to keep it from unthreading but I removed that.
I'm assuming it is paint or something else that is binding the threads, but I wanted to check to see if there is anyone can thing of some thing I might be overlooking before I go all brute force on it or suggest any techniques to get it free. I have squirted some penetrating lubricant in there.
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