https://www.youtube.com/watch?v=4m1XOw3utb4
Hereis a Model D motor run up which I nabbed from fleabay a few weeks ago. Had it taken apart since the chopper rubbed pretty good and that the motor was also making that odd noise. Since restoring the siren, it hasnt made that odd noise since.
owner of a Sentry F2 4 Model D's 2 Model L's 4 Model A's A Model J a Sireno Model D, Edwards Model F and a Western Cullen Hayes Mechanical Bell