Mine just unscrewed quite easily. Bringing the lens forward did the trick. In fact you could actually keep turning it and using it to parallax right down to a few yards. Sadly not accurately enough to range with.
No, don't have the fwb any more. It just got a bit heavy for me to lug about and I prefered it to be used than sat doing nothing. Can you remember that Herman Wierauch's buddy fancied it? I forget his name. I did have tne s&b on it. I also let that Hudson bloke loose with it. He did a full strip and service abd fitted a new one piece spring. We got it to do 8fpe. I used to go round the ft course at ponty with it and did reasonably well considering the low power, the mag, the reticule, and a consumste lack of skill on my part.