7 kg Daewoo washing machine banging during spin

[supercat20]

My Daewoo air power makes a banging sound during the rinse spins and on the final spin until it gets to the top speed of 1200 rpm. I have manually turned the drum and I can't hear any bearing noise and I have ran an empty spin cycle which again there was no noise I have also cleaned the drain filter. I did remove the back panel and rocked the tub and I could hear banging but I couldn't see where it was coming from. It doesn't matter weather it is a full 7 kilo load or smaller. Any I ideas as what it might be would be great.

 

[arbilab]

Nice looking machine, not overwrought like they tend to be these days.

 

Not familiar with the inner workings, but noting that tub movement generally diminishes at full speed (far above resonance).  This points to the possibility of a broken strut/shock or the bracket therefor.