423 Bottom side clamp, used on the Read Screen All model RD-40, CV-40 and RD-90 screens.423 Bottom screen side clamps, Read Screen All A total of 4 side clamps were used on the RD 40, CV 40 and RD 90 machines. This purchase is for one clamp only. This will be item number 1 in the Read Screen drawing. Item 2 in the drawing (rubber channel) is a high wear item and should be replaced as needed to prevent wear to the screen and the machine itself. This will be part number 2 in the drawing. Part number is 10256 for the rubber channel. These