Digging in to an A banger!

[Clem Clement]

There is a special wrench for that square headed bolt. I have seen 3 of them and own two. Very helpful

 

[Tom Wesenberg]

Be sure to install a new crank gear. The one pictured is one of the worst ones I've seen.

 

[Kurt in NJ]

I got this wrench from a 1$ box under a table at Hershey