Fiat Uno - Rattles in the back

I've decided to write this post in english.
While doing a little test drive with Fiat Uno we noticed rattling noise from the rear right. It was constant while on the move and was not dependent on the surface. After buying the car and driving it to its new home there were quite a lot of different kinds of rattling, mostly coming from the summer-wheels (yes, it's snowy here in the north) bouncing on the boot and on the backseat. After all they are as big as 13"

Well anyways. Shock absorbers felt like working ok when pressing on the corners and everything seemed to be ok on the surface. Taking the right rear wheel out was really much harder than it should have been. I didn't have a proper wrench with a bolt size of 17mm and was forced to use span-length (for our finnish readers, span is "vaaksa") stub-wrench, and the bolts were quite rusty. After taking the bolts off, wheel still sat tight and I had to kick it from under the car to get it off. Are these even the right size of rims?

After taking the wheel off the view was like that:

Fiat Uno right rear shock absorber

Moist in the shock abrsorber is wd-40 water-displacing spray that I used to get the view of connection. (Never actually thought before that wd-40 is a Nasdaq listed company with a market-cap of 831,411,989 USD as of 31. january 2013)

Different view here. Fiat Uno right rear trailing arm on the front, spring on the left, brake drum on the right and fuel hose on the up.

I had a suspicion that the part making the noise could be the upper attachment on the shock absorbers. Still I decided to took shock absorber off and noticed that it was famous Thailand-made KYB. My guess is that it is not the original Fiat Uno shock absorber so we may probably conclude that they have been changed at least once during this Uno's life of 20 years..

Fiat Uno KYB shock absorber

The shock absorber was tested to be fine. I did the test by keeping it on vertical position and fully contracting and extending it several times. It went smooth. After reinstalling the shock absorber I made sure to tighten the upper attachment firmly. It is attached with two nuts and they are easy to operate in a roomy boot (well had to turn backseat a bit, but anyway).

Fiat Uno boot and right rear suspension attachment point.

So then it was time for a test drive and for our delight the rattle was gone. Also gone was idling but we'll leave it for later.