Here's an even better picture of it. This one looks like its attached to a rivet or something on the moving part of the mechanism. The arms to move the decorative bells are fairly rare on steam locomotives and only on the very early ones (I believe). There are several variations of how it was achieved. This one looks fairly manufactured, where as some of them look like homemade stuff welded together. As usual, Flyer probably cobbled them together somewhat or adapted as they went along to try and improve reliability or decrease employee time spent on it.
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