Hi remo
Is your rear wheel alignment problem related to camber or 'toe-in' settings?
Camber is not adjustable so if this is the problem it must be related to worn or damaged parts as Davy indicated.
Toe-in settings however can be equalised 'side to side' so if one wheel is pointing inwards while the other kicks out, you could try following the attached procedure as part of a 4 wheel alignment check.
Centralising toe setting at rear wheels
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The total toe setting at the rear wheels cannot be adjusted.
The individual toe values can be centralised by moving the rear axle.
– Slacken off bolts -arrows- at mounting brackets -1-.
2 - Axle beam
– Centralise the individual toe settings by moving the mounting brackets.
– Install new hexagon bolts and tighten.
If the total toe setting is outside the permitted tolerance, or if it is not possible to centralise the individual settings, the axle beam must be checked for damage and renewed if necessary.
Cheers Spike