How to determine the difference between MSHFTLK10-122Z and MSHFTLK10-122LZ?

The difference between both models can be easily identified by doing this test with the sample

The MSHFTLK10-122 stud head spins clockwise

 

When spinning the head of the stud, the axis (yellow arrow) will move towards you and will span both elements together.

MSHFTLK10-122LZ works in the following way (green arrow):