I bought these two items separately. The lens will not fasten to the body mount. The lens is a two or three pin, so is a newer model and should fit the camera because they were made in about the same time period. It is a QBM II,III,or IV. It will only turn to about 10 O'clock and is completely tight. It feels as if a great deal of force would be required to go further and I believe would cause a great deal of damage. Neither the camera monut or the lens mount appear to br damaged, in fact both appear as though they have never been used. I would very much appreciate some advice on this perplexing prblem. Olympus I.