New to the LEE100 Holder are modular filter-guide blocks which come in one, two and three-slot configurations. These can be quickly and easily swapped over.
To fit a new filter block, make sure the word LEE faces up and the open side of the block faces outward.
Clip a new block over the small turrets on the back plate and push firmly until you feel a positive click.
Place the appropriate size of grey cover plate into the open side, making sure it is in the correct orientation, to complete the assembly.
Keep all the spare parts somewhere safe, as you will need them should you wish to reconfigure the holder with a different number of slots at a later date.