Not sure what this part is (see below). Looks like a spare accessory plate? Also 2 different size screws. There are 8 of the 3/16" that I believe are standard for the accessory plate but also 4 black longer screws which I am unfamiliar with. I don't see anything referencing this part in the documentation. No parts list is enclosed. Thanks Dave
Per the packing list, the large piece is a spacer for attaching to the FW8G-STXL filter wheel. There's a raised section on that wheel that would interfere when you mount the AO-X. The longer screws are used when you mount the AO-X with the spacer. The shorter screws are used when you do not use the spacer.
