Water-wall boiler-tube replacement kit consists of an air-powered saw and track system that tack-welds to the tube panel and cuts with ±0.125" accuracy. Also included is a Wart Millhog beveler that can bevel, face and bore simultaneously. Mounting to tubes using a self-centering inner-diameter clamp system, the beveler can perform 30° to 37.5° end preps precisely. The beveler uses TiN-coated blades to machine carbon steel or highly alloyed tubes without using cutting fluids. The water-wall boiler-tube repair system for biomass boilers precisely cuts tube panels without a heat-affect zone.