Hi all. I recently bought a Helios 44M-4 58mm lens to use on my X-Pro1. I have an M42-FX adaptor that I've used successfully with a Vivitar 135mm f/2, being able to manually focus and change the aperture manually. However, when I connect the Helios lens to the adaptor, I am unable to change the aperture when I twist the aperture ring. When i press in one of the pins on the rear of the lens, I can change the aperture but the pin is not depressed when attached to the adaptor. Can anybody suggest a fix?