Having trouble even removing this thing, screws keep spinning instead of coming off, managed to get two off normally but the other 2 are near impossible. Kind of silly the back nails have 0 grooves to unscrew, but i digress. Ive only seen one other thread on the difficulty of removing it, and pressing up and using pliers does not work. Can you refill this thing so i dont have to remove it, and if so, how?