Bread Machine Sunbeam 5891.  I make bread twice a week.  I only use the machine to mix the dough, after which I remove the dough from the machine.  In my opinion the machine is underpowered.  Also, it seems to have plastic or nylon gears and they cause quite a lot of noise when they seem to 'slip.'  But my biggest aggravation is that a black gunk forms under the paddle and I get black spots and streaks in the dough.  This black gunk seems to be coming from the paddle shaft and shaft bushing.  It has become quite loose in the housing and apparently allows some liquid and dough to get into...