Did a good job punching the DID 525 circuit and installing a new one. I sand down the heads of the pins before I drive them in. I don't know if the manufacturer says it's not necessary, but it seems like it should be. These pens are hard. Attaching the new pins worked great. The case is cheap, thin and cracked. It's a shame because I prefer to buy quality tools and expect them to last a long time. The case is part of the instrument, which makes the instrument's components well protected and easy to find. Minus one star.