An idler pulley with an integral bearing carrier insert comprising: a pulley body having a peripheral surface for accepting and retaining an endless belt; and a tubular bearing carrier insert forming a central hub along a perpendicular axis of the idler pulley body, the hub having an inner circumferential surface and an outer circumferential surface. The present invention provides a broadband wireless access system especially suited to MDUs. The feedstock then undergoes reaction to produce tracers such as ethylene, propylene, acetylene hydrogen and carbon monoxide. 0\xd710\u22124 to 10 mgcm2 per unit area of the separator.