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I had similar problems yesterday. It turned out, that it is no good idea to include "tool0" or any other additional nodes after the actual links (ie "link_6" or "link_7"?) in your srdf file

  <group name="manipulator">
   <chain base_link="base_link" tip_link="link_6" />
   <!--     <chain base_link="base_link" tip_link="tool0" /> -->
  </group>

Good luck!

I had similar problems yesterday. It turned out, that it is no good idea to include "tool0" or any other additional nodes after the actual links (ie "link_6" or "link_7"?) in your srdf file

  <group name="manipulator">
   <chain base_link="base_link" tip_link="link_6" />
   <!--     <chain base_link="base_link" tip_link="tool0" /> -->
  </group>

the first version gives the desired behaviour, while the commented one doesn't work

Good luck!