XJ40 rear camber adjustment

Hi all , Have been reading some posts on rear wheel camber . Mine is wearing on the inside of the tyre , i understand the adjustment is done by spacers , my question is do you replace the existing spacer with a thicker one OR can you add thinner ones to build up the thickness you need to correct . I’m a little confused on what to do or get done . All help and advise will be greatly appreciated . Thanks in advance . 1988 3.6l XJ40 Mark

Either way will work, have you measured what the camber is?

Hi Robin , Have not had camber measured as yet , just wanted to clarify what ways to go about fixing the problem ,forming a battle plan before going ahead . Hahaha .