Just as an FYI - if I recall correctly, one of those freewheels has a left hand thread and one has a right hand thread. Meaning you can buy one 'stock' (if you can find it) but the other really has to come from DaVinci if you want to replace it. Todd has them custom made.
Sorry - I can't remember whether the inner or outer is the odd thread... I think it is the outer as it rotates 'backwards' to a normal freewheel.
There are also a couple of different versions of the intermediate shaft over the last 25 years. It is possible that some versions lock differently if I recall.
Sorry - mostly just gibberish from me. But gibberish based on taking a few of these apart and replacing/upgrading and remembering that it wasn't just straight forward.
You should send an email or put in a question on the DaVinci website. Todd will respond within a day or two usually.
simon