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Oh yes, I'm thiking of the older style without the extra linkage.
I remember having issues when I built the bike up at the start of TCR7. The thing went through all the gears once and then wouldn't work. Eventually pulled the RD off and reinstalled it and it worked fine. I think what I'd done is screwed it onto the hanger and missed the extra linkage bit on the hanger stopper, ie. I'd screwed it down below the stop and so it was totally out of position. That's all I can come up with. I'm very careful screwing the RD back on when I travel now.
Jolly good, even you need some time off from forum tech support!
It's not the hanger that the screw grips on though, it's the extra wolf tooth-like bit of the mech. Good to know you've had no issues, however. I'll leave the nut on and it should be fine.