Brunswick A/A2 Pinsetter 4:1 Assembly Teardown and Repair. - Overdub Audio for the last 27 minutes. 

I had issues with audio for the last half of this video. I found a way to overdub new audio. That way, you can come along for the whole process!
I don't know if anybody else has a start to finish 4:1 video. This may be a first on this platform.
I hope it will help you!