Hi Scott,
Yes, I'm aware that it's deemed proper to have the pintle rotating and the ring fixed by the lock washer.
In my case it will have to be the other way around as I have a pintle hook/ball combo, and it doesn't rotate, so I have to bolt that directly onto whatever plate adaptor I get made, and will remove the locking washer and let the ring rotate.
Is this acceptable?
Regards,
Ross.