Final answer:
Tech B is correct because the anti-chatter band is essential to reduce vibration and achieve the proper finish on brake drums during turning operations.
Step-by-step explanation:
The correct answer is b. Tech B. The use of an anti-chatter band is important when turning brake drums. The anti-chatter band helps to reduce vibration and ensures a proper finish on the brake drum. Without it, there's a risk of an uneven surface which can cause noise or reduced braking performance. Always following the correct procedures and using the recommended equipment, like the anti-chatter band, ensures that the brake system functions safely and effectively.