Lee Filters LEE 100 System Instructions page 4

Polariser
The LEE100 polariser simply clips on to the front of the LEE100 filter
holder. This operation is best carried out off-camera, and with the holder
flat in your hand. Not only is this easier, but also it prevents the filter being
dropped on the floor during fitting.
Ease the whole unit into the engaged clip, then snap the second clip into
place. Make sure the polariser is secure before attaching the holder to the
camera.
4
Simply engage one clip
into the receiving slot
at the front of the filter
block.
snap