I managed to gently pry apart the spare par adapter that you mentioned at the black end
I then remove the filament switch from the extruder and then gently pried out the failed tube adapter from the top of the extruder filament
Once this adapter was replaced with the new one I had removed from the spare tube adapter it was all reassembled and works perfectly.
Here are some pics of the metal that came out of the switch that I believe was causing the original problem.
