Random Russell rides again

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Across
  1. 3. wire or rope uptake object
  2. 4. rubbing its surface, is said to entice obliging supernatural beings
  3. 8. a kitchen laborer who prepares fowl
  4. 9. burner orifice in a gas fired appliance
  5. 10. visual interface on an electronic device
  6. 13. they will open doors for you
  7. 15. suspended foothold
  8. 16. it could describe something helical or a strand like fibre
  9. 17. to voluntarily relinquish without remuneration
  10. 18. the processes of producing a cross hatch pattern on metal handles for grip
  11. 21. fibre used in early windmill cogs
  12. 22. you will see them on a cat but you may not see them on a dog
  13. 25. tissue binding device used after injury or surgery
  14. 26. converts light into electrical impulses
  15. 28. material sourced from animal hide
  16. 29. landform that created by celestial bodies
  17. 33. source of DNA evidence
  18. 34. signature textile design of Scotland
  19. 36. someone intending to buy
  20. 37. elementary currency
Down
  1. 1. a domestic tool using incline planes, levers and a fulcrum
  2. 2. design feature adopted in hockey balls from another sport
  3. 3. second prize
  4. 5. popular trading card character series
  5. 6. it has a circumference but it is not a circle
  6. 7. material historically used for visual recording
  7. 11. helpful to make your boat "go about"
  8. 12. the reason behind an act
  9. 14. evidence of postage dues
  10. 19. energy source of a medieval trebuchet
  11. 20. a wheel assembly used to mobilise tables or chairs
  12. 23. building block
  13. 24. a two beat gait in which diagonally opposite legs move together
  14. 27. the legal status of Doc Brown's plutonium used in his time machine
  15. 30. longest lasting contamination caused by 2011 tsunami
  16. 31. start of a new island rising from the ocean floor
  17. 32. two popular breeds of this species are Pembroke and Cardigan
  18. 35. 180 degrees is all you get