Don't worry about the bolt with the stripped "ears". [MENTION=61614]verktyg[/MENTION] outlined this fix somewhere and I followed the directions.

I did it on a sx410, but should work on this one as well

Provided the stop plate (thing with the tab) is correct, assemble it all together on the hanger and hold the pivot bolt on the outside with an allen wrench. Rotate the pivot bolt and put tension on the spring, while tightening up the mounting bolt on the other side. On the 410, the correct tension point ended up with the spring hole being around 10:00.

I tried mashing out the tabs of the bolt, but that didn't work, quickly stripped back out. Just adding tension from the outside while assembling worked just fine. And I never looked back at buying a replacement mounting bolt

Give it a shot - I was surprised how well it worked.

Good Luck

Joee