How do you open a safe in sift heads world 5

You will see 3 bars on the right turn right or left until it pops up keep repeating that area to narrow it down to one number and 1 bar will go up, then go right until the bars pops up again and retrace your steps to narrow to one number go left on third bar and repeat process, if you see anything missing like an outer edge piece they all look kind of like blades and if 1 is missing the safe won't open.