The Prontor Press shutter with the 127 Ysaron arrived. The front element unscrews easily enough but the rear element---is there some kind of trick to remove it? No grooves for a spanner(there are grooves for a spanner on the retaining ring though) and whats left of the element to grab on to is about 3/8ths" of thread that would be probably darn near impossible to get a purchase on without damaging the threads. Any suggestions??
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