Body Parts - idioms

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Across
  1. 4. your mate may need one when he needs help
  2. 5. if you use the grease of this one it means you have worked a lot on your project
  3. 6. don't carry the weight of the world on those or you will be very tired
  4. 9. if you twist this one, it means someone wants you to convince them
Down
  1. 1. if something brings you to those, then it is stronger than you
  2. 2. don't let things slip through those !
  3. 3. if you keep someone on those, it means you are always doing the unexpected
  4. 4. if you use this one right, you won't make many mistakes
  5. 7. when those are said to be split, then everything is complicated
  6. 8. your argument needs to have one to stand on