I think the above mentioned experiment with the bond aftermarket replacement and 825 endlinks is documented in your picture below?
(Found it on Page 92 of the Estoril thread)
I tested the same bracelet today, used the thin springbars that where attached to the delivered package and of course had the same result: The same gap which can be seen in the picture and a resulting unacceptable jiggle of the endlink. But then I noticed, that the delivered springbars where much to flimsy for the drilling in the endlinks. The original ones from the Estoril are thicker and fitted exactly. And what should I say, also the endlinks where compatible just by using the original Estoril springbars. When looking at the picture above, I have the feeling that these are also not the Estoril springbars ? I made my tests quickly only with one side of the bracelet as I had no time. But during this weekend I will come back the bracelet and will take some pictures. But I think chances are good :)
Edit: Just compared my endlinks with the picture above and noticed, that there are fine differences. The 825 print is placed in the middle of my endlink and the are small widenings at the bottom to suppress jiggle. I will catch that in the pictures.