Thanks for tips...!

I thought of WD40 myself but it is too liquid so I used standard grease on the springs and bottom side of the metal disc below the springs. It's all smooth now.

Do not use Wd40. It will over time erode plastic parts such as orings and rubber gaskets. Silicon spray is the recommended Lube.

You should try to avoid spray lubricants, made my old EVO worse.
What did help was using a candle, not just on the disc but on the shaft where the disc slides.
Seems like some sprays degrades the plastic and makes it coarser.

I know what you mean. My first thought was KY Jelly.

binky9

Proper Grease Specification
 

Search for Grease / Plastics / Synthetic Polyolefin (PAO). It should meet the Specification: DOW EM-30L. The label on mine is "M-Kote EM-30L NLGI #1" It is distributed by PP&S (Whoever that is...) and is available from venders on E-Bay. I recommend the smallest quantity available since a little goes a long way. I have not had to reapply the grease more often than every 3 months or so.