BlockDesign - skrypt na dekorowanie bloków

on rightclick on quartz block:
    if player's tool is iron shovel:
        wait 10 ticks
        set block to pillar quartz block
        damage player's tool by 1
on rightclick on pillar quartz block:
    if player's tool is iron shovel:
        wait 10 ticks
        set block to chiseled quartz block
        damage player's tool by 1
on rightclick on chiseled quartz block:
    if player's tool is iron shovel:
        wait 10 ticks
        set block to single step:7
        damage player's tool by 1

on rightclick on sandstone:
    if player's tool is iron shovel:
        wait 10 ticks
        set block to sandstone:1
        damage player's tool by 1
on rightclick on sandstone:1:
    if player's tool is iron shovel:
        wait 10 ticks
        set block to sandstone:2
        damage player's tool by 1
on rightclick on sandstone:2:
    if player's tool is iron shovel:
        wait 10 ticks
        set block to sandstone
        damage player's tool by 1

Sandstone można cofnąć, ale kwarcu już nie?