This is not my lamp. I came across the pictures here Searchlight Projector - Victorian Collections I have seen a few SL1's but this is the only one I have seen like this. It would need to have slots in the underneath of the box on the case so they could be loosened, case moved and then bolts tightened up. I'm not sure that the box is even long enough to accommodate the slots in the case. Could those be for something else perhaps ??