In smaller easily fix this support and will retain its discretion. Since its purchase, I washed my bike several times at the corner Carwash is no surprise with these two seals from silicones and other it is totally waterproof and submersible. Even by concentrating the jet of Karcher on the casing I is found no infiltration of water or soap. Short on top quality for a really small price.
I recommend this excellent article, which managed to give me satisfaction.