Balder sent me a head so I could pull out the driver to do a driver swap with my previous review sample HD-1 New BALDER HD-1 [ AA - 14500 - 2 mode EDC ]
But I thought , hang on a second ! If I remove the retaining ring / joining ring [ holds the driver in place + allows the two halves to screw together ] , I could swap between heads !
Yay !