I have 2 sets of iodine wheels, one (which is a few years old)is currently running a 20mm adapter and the other is running a 15mm (which is less than 12 months old).
I attempted to swap the adapters over today but there’s an inner tube in the hub in the newer ones which stops the adapters from fitting.

does anyone know if the tube needs to be removed/replaced or are there different 20mm adapters that I need to get?
Thanks in advance Andy