So my TZ knocker was really weak. You could barely hear it and it would never scare people as it's supposed to do 
. Of course I replace the coil sleeve, checked the plunger, tightened the plate
it strikes against but nothing seemed to help. Then I read on the internet that they sometimes install the knocker too low in the cabinet and I decided to measure and compare to my other pins.
It was indeed about a cm (half inch) lower. After moving the whole assembly up that amount the difference is striking. Now it even makes me jump.
It really puts a smile on my face when I finally fix something and thank God for the internet.
Hope this info helps someone.
Edenton, NC
and instead I hear this 
during the replay/ extra ball awards. Thanks Apekop.
