thanks for both your comments! my new unloading auger is supposed to be here in a few weeks. and i was just gonna replace the flighting on the grain tank auger as Don suggested, would like to use poly there but i haven't found a source for it yetIJ i bought the bubble up and unloading auger from Worthington....loewen, both has the "super edge" flighting with the bubble up being hardened top to bottom also. my bubble up isn't worn out completely as it is the NH Rice one with all the hard surfacing weld on it, but it is wearing out between the welds and the tube. thanks, JD