Here are the instructions:
http://cdn.splparts.com/tech/SPLHADJ.pdf
Mods, If the OP doesn't remove / correct this DIY I would suggest deleting this thread before more people follow this nonsense and possibly destroy their $280 arms.
This issue might have been corrected on the customer's alignment, but I don't think it should have left the shop like that even in a simple measuring tape install / alignment.