just take a pic of that nib and post it here but I wouldn't shave the pencil or do Anything violent. Worst case scenario all wacom pen can be disassembled but I Would take needle nose locking pliers with grip ... the smallest I could find. I find the best thing is still that little gripping ring that comes with wacom tablets... you can order one it will work with aiptek too . If it's becAUse you dont have enough nib out to get a grip with plyers then use a needle to pry the tip out a little more so you can grip it. I just browsed a bit and it seems the company really suck at customer care... you are not the only one having trouble with it. So when you got the thing it came with spare nibs plyers and nothing in the instructions mention the procedure?
I don't know how to help if the nib is showing but you can't pull it out. But if it ends up so you don't have enough of the nib to grasp at, you could cut down the sides of the pen with an exacto knife until more of the nib is reachable. That's what I did to my wacom pen, which was fine since I was just shaving off unneeded plastic.