My clips are so tightly fitted in that milled handle pocket I don't know how they'd move... perhaps the tolerances are different. For example, I can unscrew my clip on the Seb and I have to almost pry it out of the milled slot to get it out.
And on the original topic, I love the clip on Sebs and Umnum. I love the double point contact on the pocket.
The Spydie wire clip on the Caly 3 is pretty darn sweet too.