Kitchen drain installation

[Ino]

5. No, no... that's not the part I'm talking about

This part I get -- "Metal / ceramic / etc flange of tailpiece -> plumber's putty -> sink lip -> rubber washer -> plastic or fiber washer -> nut." -- that's where the drain hooks up to the sink itself.

It's the NEXT part I'm having trouble with... the part where the TAILPIECE hooks up to the drain. It is leaking. I don't think plumber's putty is called for there.... but maybe that white tape that wraps around screw threads?

Also... the tailpiece washer makes the tailpiece a smaller diameter at that point. The washer and the criss-cross part of the drain's bottom thus overlap... doesn't gunk get caught in between and around them? I can see that area getting icky real fast. Is that right??

It's this connection...


This is the type of washer/tailpipe/nut I have...


Thanks!