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i can find no similar part. is it avaiable somehow?

bad robot arm

ok i found part 53989 which is similar, but it's filed under a completely different name. Sorry

They're probably functionally equivalent, but looking at those images they differ in the thickness of the arm.

Indeed, they are different. What about creating an alias with "Needs Work" notice, waiting for the true part to be created?

Yes, that sounds reasonable. Please upload