You can get extra drums set them for what you want and there is a place on the drum where you can mark what that drum throughs. I’m working with as light as you can go loads and still work. No disk worked for me so I drilled and taped the disk that was bigger than what I wanted and dialed it in. But still had the problem of them leaking, spring hanging up etc. I had three of them. So I sold them and got the drum 110% better than the disk. Don’t think it was ever taken me more than two minutes to dial what I want in. I use it now when wanting to test different loads. Lot easier than dragging out the Charge Master letting it warm up, calibration then checking.