But........
Here's the flange. Hard to see but the flange isn't dead flat inside as the casting shape starts to curve slightly. This initially indicated to me to put the washer in with the tapered side down so when it pulls up tight, the tapered part of the washer stays clear of the casting rounded shape.
Then the fully flat face of the washer must contact the split nut, and if that is the case, then why have the slightly raised section on the split nut?
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