It takes some practice to disassemble the top end so the spring doesn't fly all over the place. But with a little practice it becomes second nature. The first few times I did it I really fumbled badly. Now it's second nature. Get a plastic bushing wrench to do the work, they only cost 4 or 5 dollars and last for years. Wilson makes a good one, but I have another that is just as good. You can find them in steel, but that will mar the finish of the gun, so plastic is the way to go.