Ahojte, ja som dostal od Alexa podobnu, no trocha obsirnejsiu odpoved, kedze som sa pytal, ci je to problem a ci ju tam mam dat sam.... 
Thank you for contacting SRAM Rider Support! The screw you're referencing was added as a running production change earlier this year. All derailleurs produced before this change will not have this screw.
There is no issue using the derailleur without this screw. In an effort to provide a complete answer about whether it should (or can) be added, I have contacted our engineering and product teams to request additional information. I will give you an update as soon as more information becomes available.
Thank you for contacting SRAM Rider Support! The screw you're referencing was added as a running production change earlier this year. All derailleurs produced before this change will not have this screw.
There is no issue using the derailleur without this screw. In an effort to provide a complete answer about whether it should (or can) be added, I have contacted our engineering and product teams to request additional information. I will give you an update as soon as more information becomes available.
