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It looks to me that it is not a bolt, but a die-cast lever held onto some small shaft by a Phillips screw. If it is what it looks like - undo the screw and look for a closest replacement in :
1 Bunnings
2 Radio parts store
3 Bicycle store (maybe, some part or instrument).
It can be even round - who cares? As long as it fits and does the job.
Just my 2cents worth.
P.S If you keep both parts - you can even cast yourself a new one from epoxy (needs some skill, though).
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