Shay drive shaft clips

[Vidshooter]

I had cracked gears and obtained a replacement set.
I refitted one of the shafts OK but one of the little clips for the other shaft won't stay in place.
I have used a new clip but I can see that the amount of metal that the clip has to clip onto just wont support a firm grip of the clip.

So what do I do?  Has anyone worked out an alternative way to hold the shaft in place so the gears mesh? Because my clip is never going to clip tightly.

Thanks
Erik