Well i took mine apart again yesterday and found that when i put it back together last time the carbon brush got jammed by the tension spring behind it. My advice is when you put the end back on as per the guide, put the thread through the spring (not the brush wire) to pull the brushes back.
My pump is now working perfectly, hopefully it'll last, if not i'll have to buy a new one.
My pump is now working perfectly, hopefully it'll last, if not i'll have to buy a new one.