Hi Ken,
Last year Derek Thomas ( formerly of Sunpath ) told me about the work that Kyle Collins did for them. He said it was a fair amount of very small changes to the rig; i.e., things like a change in the radius of a portion of the yoke pattern, etc, etc.
It was about '03, at the Symposium, that I was talking with Derek ( he & his then wife Pat, bought Sunpath about '94 ) and he said that, from the original, it had over 135 changes to it. Now, some of those would be to the TSO'd portion of the H & C and some would be to the non-TSO'd portions.
Just some trivia for those who like this stuff,
Jerry Baumchen
PS) The Javelin was originally TSO'd under C23c where you select what Category ( weight - speed, make a selection ) you want to certify it under. Later, they did the three Strength Tests per C23d, where you select what weight - speed you want to certify it under; then the FAA granted them certification under C23d, or so I was told.
ETA: My error, I was talking with Derek at the '07 Symposium.