Instruct: Classify a given Amazon review as either positive or negative.
Query: Silly Engineering Mistake

The engineers who designed this product really messed up. They situated the shallow C-clamp on the same side as the roller crank which makes the opposite end flap up off the board or table every time you turn the crank. You need to use both hands in the rolling process. Unless you have a helper, the flapping must be tolerated. It's irritating and severe enough to loosen the clamp. That was rather dingy!