A projecting display system includes a light source which produces light which is spatially modulated by a number of spatial light modulators. A resilient element, in conjunction with the linked levers, produces a powered assist in the act of opening the blade and also in the act of closing the blade. Embodiments of the device are relatively light weight and adapted to removably couple to sewer cleaning vehicles. Example clamps may further include jaws holding the ball subassembly and a biasing element that permits tightening of the clamp. The drain channel is provided with a mouth portion which is connected to a collecting channel.