Yesterday I was drawing with my ipad, and then I noticed the tip slight bent to a side found it weird, but ok, it was working as expected, so today I was drawing when sudenlly the tip snaped in half, i pcked it up and looked what had happened, is broke off on the smaller section between the one you screw on the pencil and the tip itself, the inner part is stuck inside the pencil, if I put it back in place just to test it I can see that the pencil is OK, working nicely and recognizing pressure etc.. it's just the tip that is the problem, how can I safely remove this bit so I can replace the tip?