Cuisinart CJK-17BC Cordless Electric Kettle "black inside" Questions

black@decker stainless dome kettle (red) electric kettle. we've used it for a couple years and it works great, but there are deposits inside basin that we can't get off with soap/water. they're almost

...inside this rectangular piece it put in properly - it should be against the little black doo-dad on the lid. If everything is sitting happily together, you should be able to snap the other black part ...

...are horrible for parts, hence I will never buy anything from that company again. I went to the hardware store and found a black plastic knob, added washer and nut inside--voila! Fixed for about

...in the center fits inside the middle part and it also has holes in it. and last is the lid. No glass perculator thing on it just a black knob. Looking for stem for a REVERE WARE 5 cup-84