The Glass Aroma Tubes Are Too Tight To Fit, Did I Receive The Wrong Ones?

No, ArGo Aroma Tubes should fit in the ArGo unit, you may just need to preheat the unit and press the Glass Aroma Tube firmly in place for the first couple of uses. Run the unit for a full 10-minute cycle at 200 degrees Celsius and then try inserting the Glass Aroma Tubes again.