A multi-point communications system is set forth herein. The enclosure comprises a base having a channel, a first L-shaped door rotatably attached to a first side edge of the base, a second L-shaped door rotatably attached to a second side edge of the base, a door-to-door seal abutted to a flange on the first L-shaped door, and a compressible base-seal inserted into the channel. The structure for maintaining the pledget is integral with the cartridge. Part of the conductive paths 61, 62 are connected electrically to LED chip 40, extending from the position where the LED is mounted to leads 21 and 22, to which they are connected by soldering. A coupling for selectively transmitting axial movement to the link member may be provided between the link member and the control mechanism so that the constricting member cannot apply a damaging amount of force to the body canal.