Finally got my DLA-RS2000 and installed the DCR-J1. Piece of cake.The Lens Retainer will lock into place when the lens is attached and the attachment screws tightened. Even before fully tightening but after assembled you'll find the entire assembly is more difficult to rotate. That's the time to make sure the rotation setting is final, then finish tightening. You do not need to overtighten for all to be well.
And since well meaning forum members have been concerned and commented about heat in my projector cabinet when posting pictures, notice the thermometer showing 72 degrees after being powered on for over 4 hours. There is a lot of space inside the opening, a lower level below the shelf, and 4 thermostat controlled fans with air intakes on the bottom of the cabinet that rarely come on.