To install the inlet elbow on your Comet Static 1700, you will need to fully remove the plastic casing of the machine. This provides clear access to the inlet and allows you to tighten everything down. Here is a video demonstrating how you will need to install the 90 Degree Elbow:
Keep in mind that you are doing this at you own risk. If you lose a screw or break something, this will not be warrantied.