Thanks again for the replies everyone, I appreciate everone taking the time to discuss this with me...

the aperture blades move great, I see no resistance whatsoever - smooth operation. what I have found is that the 2nd peice of the lens is moving, the one that is inserted into the focusing mount. If I fire the shutter with the lens removed and only the focusing mount attatched, I see no movement. I am suspecting the problem is that the lens is not screwing tightly enough into the focusing mount...any suggestions on how I may tighten this - is it even possible?