If that part is cast it is not likely to be 6061 which is not a casting alloy. If I was machined from billet it may be 6061. Can you tell how it was produced?
How much does that part cost now?
Robert
I assume, but have to ask, you've checked with Wheels Mfg?
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When you get the drawing done let me know.
Tlom S.
Wheels manufacturing #237 certainly looks like the part. http://wheelsmfg.com/derailleur-hangers/derailleur-hanger-237.html