Note that he little "nubs" can sometimes turn away from the slot in the end link, so they are not easily seen. Try spinning the spring bar around and see if they appear.
If you are 100% sure they are not there, then best to see a watchmaker. You can employ machine shop measures like drill presses and cobalt drills (!), but personally I would just cut them out with a file - take a couple of minutes to do by hand:
It's a little more "watchmakery" than taking a drill press to the bar...
Cheers, Al
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