Singer 9022 Bobbin casing?

While in the midst of a project, there was a bobbin malfunction which caught the material into the machine. In the process of removing the material [cutting threads carefully] both the bobbin and the casing came out of their place. In trying to insert the casing back, whenever it seems 'right' it is too high for the slide to close over the bobbin. Any hints or instructions of how to place the casing properly will be most welcome!