Need tips on restoring vintage Rotring multicolor pens; can offer tips on restoring Fend multicolor pens

[Billiestylo]

Hi, I collect vintage multicolor pencils and ballpoint pens made by Fend and Rotring.

 

While I have already repaired/restored many Fend pens (German Norma, Norma Contra, Super Norma, Truxa and Vision), I am still looking for the same kind of info about vintage Rotring pens (rotating mechanism, gravity mechanism and slider designs).

 

Can anybody help? In exchange, I can offer instructions about the above Fend pen families.

 

Thank you for reading....

Edited December 6, 2020 by Billiestylo