What Weight Do You Need? Doing the Maths – 14 min Steve MartinApril 20, 2022 Back to: Sidemount Course | 26 h 10 min split over 170 videos Previous Lesson Cylinder Trim Check & Sliding D-Rings – 11 min I review different types of sliding d-rings and show how to keep cylinders streamlined throughout your dive Next Lesson What Weight Do You Need? Expanded – 20 min Following on from the previous video.. What Weight Do You Need? Doing the Maths. We expand and go over all the fine details to help you understand better our diver weighting concept.