Can't find the B-tension screw in rear derailleur I am trying to register my old rear derailleur (a 15-year-old Shimano &quot;7sis&quot;), and I'm trying to find what every guide calls the &quot;B-tension screw&quot;. I looked everywhere and couldn't find anything that looks like it. I only have the two screw for the upper and lower limit.
Here are a couple of pictures:


Can anybody point me in the right direction?
Thanks
As other comments have stated some older derailleurs did not come with a "B" screw. This is also true of newer low end components.