How to replace the horn/buzzer in your Lionel diesel locomotive

Some postwar Lionel diesels came with working "horns". They are mechanical buzzers powered by a 1.5V D battery. There are a lot of them that have quit, or the battery compartment has been rotted out due to the battery being left in. As long as the RELAY is intact I have a solid solution that swaps out the original buzzer for a new more reliable one. They may not sound the same, but close enough to satisfy this operator.
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Here are 2 links for the mechanical buzzer. The first link is exactly what is seen in this video.
Canadian Mechanical Buzzer Link www.maddison.c...
American Mechanical Buzzer Link: www.wholesales...