I needed to adjust my drive disc and found there was an official tool for the job but it can be hard to find and is pretty expensive for something you may only use once or twice so I used the official measurements to create this thing! I designed it to use as little material as possible while still retaining strength. Its only about 1/8 inch thick and about 1" wide. Do not scale as you may distort the accurate measurements. I made sure it prints to exactly the size needed and it includes both a minimum and a maximum point for your drive disc.