My much used 75-240mm lens last night lost part of its lens mount. Half of one of the three grips snapped off due to spring pressure inside the camera mount. Thankfully it made it through the sub-sun light show I was greeted with. I have replaced the mount myself on the common plastic lenses like the 28-100mm and 18-55mm with cheap copies and they are easy to do. I cannot find a lens mount for the 75-240mm though, presumably because there is no call for them. So I was wondering, what sort of charge does Nikon make for lens mount replacement - if they are still available? The 75-240mm was not popular I feel. For a light but sharp zoom I was also looking at the 70-300mm G lens, which seems to be available new and have better parts availability. How do the two lenses compare? I was wondering if getting the new lens would be a better route to take. Thanks for any input, Ian I attach the last photo it took prior to a part snapping off.