Remove one of the locking screws, install the adapter onto your port, then replace the locking screw. This will ensure that your port can be locked in to the housing.
Use a 2mm Hex to Remove One of the Locking Screws
Insert the Port Fully Into the Adapter
After the port is fully inserted into the adaptor, rotate the port until it touches the remaining locking screw, so that the port can not be rotated any further. If the port is not fully inserted into the adapter, it will not be possible to rotate it.
Replace the Locking Screw. Port is Now Locked to Adaptor
You may now insert the port with the adaptor into the Olympus housing, then secure the assembly as you would with any Olympus port.