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A smaller diameter tube is easier and also if you are using a board that curves upwards e.g. wakeboard or skateboard. if you turn it upside down and stand on the base then it will be easier. good luck :)
When you say you wipe out are you falling forwards or is the roller slipping out or some other thing i didnt say ? It took me about 10 mins but i have been doing wakeboarding for about a year
DIY Wakeboard/Surf Trainer ...View Instructable »