I believe it's the government
The answer is: The issue of endangering patients health with an unknown experimental treatment
Experimental treatment is still in the testing stat and still hasn't uncover all the possibilities that the treatment can cause to the patient.
Depending on the dosage and the genetic composition of the patients, experimental treatment cause a lethal effect to the patient. Because of this, the Scientific community require all experimental treatment shall be done to animals before it used to human patients.
When the patients have no choice for other treatments beside the experimental one, the researchers need to openly mention the possible negative effects to the patients.
Gears are supposed to be softer than worms or pinions so they don't cause as much wear. Each tooth of a worm or pinion meshes with the teeth of the gear many more times in it's life than a tooth on the larger gear, two hard teeth meshing will wear more than a hard ans soft teeth. Having a steel gear would cause the worm to wear out too fast. Ideally the worm wheel should be phosphor bronze but bronze is expensive and plastic is cheap.
Answer:
the answer is normal fault srry so late hope this helps
