Martin,
Im sure i could dig one up for you and when it is out i will inspect it for any visible cracks (to the naked eye)
weakness did you mention weakness
there are no guarantees to longevity as this is a well used part and it depends how hard the gear changer is. (ie. previous owner/yourself) and adjustment of linkages to aid in a smooth and effortless gearchange.Just remember to grease everything very well on reassembly and adjust all linkages (as these to will have lots of wear as well)for an easy gear change.
You know your going to have to stop doing all those reverse to firsty's power takeoffs
it takes its toll on shifters you know..........
cheers
Scott