Thanks, your Dudeness. 
Can't claim to have really figured it out though... all I did was change parts until the fault went away, I can't see what was wrong with the old shaft.
I have the photos available at last (accidentally shot without the SD card, so it put the images on internal memory which I could only access once I'd found the cable that I'd carefully hidden from myself).
New item on the left, old on the right and, aside from the claw being a bit squashed after my little experiment, there was nothing to choose between them.
![[Image: P1080800s.jpg]](https://s19.postimg.cc/y9goxuspv/P1080800s.jpg)
Still, having changed the bits that didn't cure the main problem at least second gear does go in more securely now. And hopefully this lengthy waffle might help anyone planning to make use of Deefer's cunning technique for changing the selectors.
Can't claim to have really figured it out though... all I did was change parts until the fault went away, I can't see what was wrong with the old shaft.
I have the photos available at last (accidentally shot without the SD card, so it put the images on internal memory which I could only access once I'd found the cable that I'd carefully hidden from myself).
New item on the left, old on the right and, aside from the claw being a bit squashed after my little experiment, there was nothing to choose between them.
Still, having changed the bits that didn't cure the main problem at least second gear does go in more securely now. And hopefully this lengthy waffle might help anyone planning to make use of Deefer's cunning technique for changing the selectors.