My General has a clean out door in front. When it starts filling up, the door pops open. I thought it was an early warning device. :-)
I'm betting that blade tilt, and height elevator were getting harder to adjust.
Mine has a floor, and was about 1/2 full when I brought it home. I cleaned it out right away, and there were 3 Forrest WWII's in the bottom, still in the unopened packages. I thought that made for a "better deal"