Hi
iv seen this a couple times online and me personally would see if Dyson will replace your unit as Dyson handheld vacuums are not made to be taken apart at all(on the motor housing side that is)
if you really wanted to you could get it but would cause severe damage to the device in the process!
if its a v15 its fairly new so just in case I would let Dyson deal with it as if you take it apart they might void your warranty
sorry there isn't much of a solution
but I hope all goes well for you
Thanks:-)