| Kopp TL-4700 WALK lens. | Side view of the signal. | 
| The Streamlines were pretty easy to disassemble and reassemble.  The lens and visor both fit into a lens collar, secured in place by a screw that tightened the collar.  The reflector was fitted to a heavy rubber gasket that seated it both into the stamped metal housing and against the lens in the collar. The reflector fit into the housing, the collar snapped into a set of hinge holders, and the whole works swung shut, secured by a clasp. | 
| Reflector, visor, collar and lens. | Visor and lens in the collar. | 
| Reflector with gasket. | Reflector (normally in housing) seated to the lens. |