For Sale is a good used McCulloch Pro Mac 10 series Handle threaded insert and bolts. 

This fits:

McCulloch Pro Mac 10-10 and Pro Mac 10-10S

McCulloch Pro Mac 700 and Pro Mac 4300

McCulloch Pro Mac 60, 55, 555

This may fit many more McCulloch saws so please ask about your application.

Check out my store for more parts your McCulloch saw.