Slingshot help

I am at the part where you you have the big wheel with 3 different doors and 3 different puzzles. I did those. I have found all items in the first location (hidden crowbar). The second location, I freed the professor and know where the slingshot is but can't get it out. I have a 'container' in my inventory. I know where the ring is and the heart is on the big spider screen. Any suggestions? PLEASE!!! Thanks a bunch!!

Motorhead, Use the container and capture a sparkling light flower. Place the container back where you got it. Good Luck.