I think you have purchased Chinese hub locks. Last month when I checked Kabli ones were being sold for 10,000 plus 2,000 for spacers. While price of new set was around 35,000. The mechanic suggested me to get the hubs changed altogether if spacers were to be avoided.
Anyways, Chinese is not a good option. Can break under extreme conditions. So it's better to change to genuine (old or new) whenever possible.