The new ones are a tad thicker I think. If Plus 4's can break them then maybe the damper is part to blame but it doesn't explain why mine was pulled away from the backplate.
All sorted now.................
I've washered both sides. This is the tight access inside the brake drum.
You can see the thick washer here.
I've also increased the thickess of the washer on the stub. The one furthest away in this photo.
