Been there, done that. I don't trust the circlip idea. Sure, it's fine when it's an internal clip for a piston pin, but using it externally I foresee a lot of clips falling off the shafts. A little circlip isn't going to stay on when traveling .25" back & forth upwards of 60 times per second.
I did this idea and had little shafts made for them. Had the shop harden them to Rockwell(?) 60 and then polished them by hand. The clips we used needed to be spot welded to the shaft since there was no way they would stay on. IMHO the best way to secure the shafts would be to mushroom the ends like the factory did originally.
Here is a thread covering what I did several years ago. If the pics don't work, let me know and I'll see if I can get links fixed.
http://www.turbo-mopar.com/forums/sh...ghlight=rocker