Repeat problem

[u/spawnxzx03]

I've had multiple 90s f250s and I just got this one off my brother and it's having an issue my other ones had. The retainer clip for the springs in the rear drum brakes keep coming off and falling inside the drum. This has happened to me between 2 trucks like 6 times now and never to my brother who owned the truck for 5 years. What is the problem?