I have the following information on my starter repair page:

"One item take note of is that that there is a ball bearing that drops into a hole in the end
of the clutch assembly. The spring that rides on the plunger in the solenoid rides on that ball bearing. Whenever you take the starter solenoid apart to replace the contacts, make sure that the ball bearing remains in the hole in the end of the clutch assembly. It can come out and yet remain inside the starter and cause a grinding noise and lock the starter if it falls into the right spot."

r.c.brown@ieee.org
TruckEditor@tlca.org
Project: 4Crawler
4Crawler OffRoad - 4x4Wire discount code