The TTS R8 collet is .75", Tom. I have held a loooong flute .750" endmill in it for initial machining. Of course, once I progressed to the rest of the tools I had to touch down the first TTS tool to re-establish Z. Even if your part is fully contoured with the 1" ball-end, you should be able to find a surface (vise jaw, tooling plate, etc.) to touch down the first tool for a reference Z once you're done with it. Just a thought.