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Curious how well the 16FP4 (60 degree) worked as a replacement for the 16AP4 (52 degree)? I would expect the additional 8 degrees of deflection required was remedied some how?
I tried a 16GP4 (70 degree) in place of a 16EP4 (60 degree) in a Zenith porthole, and ended up with a neck shadow issue of about an inch, as the yoke couldn't be slid enough forward.
I read once where the "old timers" would soften the yoke in an oven, then force it over a bottle to flare it open a little. Fixed, LOL... Gotta love them old timers.
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