I am in a class in college where i have to improve or create a new product to solve a problem in the world. Me and my partner chose to improve upon the post hole digger (the manual kind). Now in order for us to keep rolling with this idea we need justification. Thats where your help comes in, if you could please post or message me if you have had any experience with manual post hole diggers and tell me what the kind you used and what you liked/disliked about it and how well it worked, maybe even the type of soil you were digging in because that makes a difference. Thankyou.