I bought a 27-6550 gearbox thru Amazon warehouse, $100, damaged box. I was sure I was getting somebody's return because it's not quick ratio, but free returns so why not try? It came today & I just checked & it's the correct ~2.7 turns between stops. There are no signs of installation... it looks 'rebuilt' new. I can get $27 for my core, which I'll do unless I have to pay for shipping, then probably not worth it.
There are at least two more on Amazon Warehouse... if you have Prime, no harm in taking a chance on one.
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Is the finish more of an undercoating?