3/8 shaft, is it strong enough.

[lemiant]

Hi guys, klunk and I are working on a project which appeared on delphi a couple of weeks ago (http://www.chiefdelphi.com/forums/sh...php?p=1072208). I suggested using a 3/8" bolt for the main shaft, but after seeing it in the CAD, I'm not sure that it is strong enough.

Functional View (components in this one are not to scale): http://www.youtube.com/watch?v=U5tHtntT9gU

Exploded View (components in this one are to scale): http://www.youtube.com/watch?v=f9mpx6MWe-k).

In the configuration we have, how much force could be required to pull down the see-saw, before something bad happens to the 3/8" shaft?