I have 3 around the center, 11 around the big ring, and 14 around the smaller. It's just what worked for the patterning and is not completely accurate.
I need to add some curvature to the features in the center sections but was able to use circular and linear pattern to get it to work. The details in the curved sections are the last freeform details that I need to add to my version of the bolt:
My version so far:
BlogMickey dot com has a great image of the handle detail:
And lots of other stuff from the displays, just search Percy Jackson on the site.