Dear Mroe,
I have to say thanks for your interest and your suggestions 
Could you tell the thickness of mentioned steel washer?
I mean that is very important and exactly that thickness was the reason to create an additional part for my solution (the recessed washer).
To explain that I’ve edited above in chapter IV a few words about cup springs → jump
I do believe that grease is not sufficient for our cup springs.
Crucial for the kit’s proper function is an anti-seizing compound - the brand is of course meaningless.
(I’ve learned to know Never-Seez when I was working in the chemical industry 30 years ago and made since then positive experiences only therefore I’m stuck with that stuff.)
There is also a short private message in your mailbox.
Cheers,
Chris