Hi Nigrob
The only way to do this is to put in for a "Change of Circumstances'. This will trigger a review of your entire claim and will normally require a new assessment. You will have to be very specific about why you need the dossette box, and how it helps you to manage your pain. Try to go for one extra point is always difficult so if you are putting in for a change of circumstances, I would see if there is any other area that could be covered.
BIS
Nothing on this board constitutes legal advice - always consult a professional about specific problems 
