I think I know what you are on about, you mean the metal inserts that hold the end block in place?. If so I agree they are a pain when compared with a screw in end block. At the end of the day its probably a cost cutting exercise. There is a link to a video below if anyone does not know what part you mean.
https://www.youtube.com/watch?v=7Ux0xVwUj54
Kindest regards
Barrel