PU foam spring failed

The PU foam spring of the left McPherson strut was failed. The right side is ok. It could be the material is degraded after 20 years. Maybe the wall thickness is too small. The cylinder shape buckles outward. Every time I take a right turn the wheel touches the wheel box. I have fixed it today by wrapping cotton tape around it to prevent the cylinder from buckling.

The recess on top fits in a hole in the wooden body. A aluminium tube glides in this 'bearing'.