hi i hope this post is in the correct forum as i am new here. i am doing a home project and building custom cabinet/trunk that opens like a car hood. i am in the process of buying gas springs to ease in the closing and opening of the door/lid (and to stay open when at the top position). i realize that if the gas spring/shock is too powerful it can result in the bending of the material (while closing or preloaded), or if it is too weak then there is no assistance while opening and the lid cannot remain in the opened position by itself. what formula do i need to calculate this? the lid will be approximately 50 lbs, but i am considering other materials that may weigh less or more. so an equation and explanation would help me a lot! i am hoping to learn from the calculation process instead of getting just a straight answer as i plan to build different cabinets of all shapes and sizes with different gas springs. the door/lid has TWO hinges so i will be using TWO gas springs in total. the lid will NOT open to 90 degrees upright. here is the idea and some measurements. http://email@example.com/cabinet.GIF what force lbs gas spring should be used in this project? thank you in advanced for your help!