Well, I support your efforts to find an alternative, but yes... the bar should bend/break before anything else. Woodcraft and other companies have been doing this for a while now and have replacement bars for $10 MSRP or cheaper from other sources. I know you have a vibration issue you are working on as well, but how about a flexible, weighted insert into the hollow bar?
The first thing I would try is to put the heaviest chain that will fit in the hollow bars. Next I would take lead weight discs, drill a hole in the center of each and string them through the bar (latex dipped). Just some ideas so you can customize the weight and placement. Either end or in the center via small holes drilled in the hollow bar to hold in place.
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