I changed the glass on my cerebus to the straight glass the cerebus came with and it worked. No idea why you are having issues. I would not have recommended it if it didn't work for me
Edit unless the rebuild deck changed since first released. My rebuild decks I bought years ago
Edit 2: I just pulled one of the new Baby Rebuild decks I got in last night and tried it in the cerebus and it wouldn't even fit to screw in. SO apparently not all Baby rebuild decks are created equal
The rba decks I got do have the right threads to screw into the Cerberus. I haven't tried the straight glass but will definitely give it a try when I get home from work tonight. Thank you.