Them bolts were smaller on the first machines. Be sure you have the larger ones or at least grade 8. Have dealer check '99 school book for info. I'm unsure if there was a campaign to do that or not. We have a couple with the turret and they've been no problem. Most guys get by just fine with simplicity of the standard auger but many are thinking turret next time around. I think my choice would be the 14" with long spout and if it didn't reach up and out far enough I would build it longer. Problem with rear feed indicates a feeding problem. Rear feed stripper should be in for corn only. If you have rock sump installed it could be causing a problem. I prefer having hump fastened to door and third helical extended over top left of feeder opening to reduce or eliminate rear feed problems. Going from 1" to 1 1_4" spreader bearings seemed to help with bearing trouble but I think installing triple lip sealed bearings helped us more than anything. I hope the loosened injector line just spilled some diesel!!!!!!