Here are couple of possibly helpful link to some resource information for 1928 Chevrolet. They do not specifically cover "Hercules" info, but includes basic 1928 chassis/running gear info.

1928 Chevrolet Car and Truck Data from the GM Heritage files.

INSTRUCTIONS FOR THE OPERATION AND ... - NATIONAL SERIES A B - MARCH 1, 1928

1916 - 1928 Chevrolet Parts for Four Cylinder Models (no helpful pictures unfortunately)

Hope some fellow "Early Bolt Owners" will chime in with other possible help or sources. smile

~ Dan
1951 Chevy 3 window 3100
Follow this story in the DITY Gallery
"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)