I bought a kaleidoscopic laser pointer, but one of the heads are stuck and I cannot get it off, I tried screwing it off over and over, but nothing. Help?
Yeah, that can be annoying. If it's really stuck in there, you might have no choice but to crush the attachment a little so that you can make a connection with the internal part of it.
One thing you could try... although not really that good an idea, wrap the tip/laser in plastic, run under hot water for 3-5 minutes, than stick it in the freezer for 10-15 minutes... Basic expansion/contraction used same approach with plenty of things, but... idk how well that would play with the diode, definitely don't get it wet.