level 19

I have completed all the boards but when I try to use the boards or the trowel I can't get any further. I also have 2 magnifying glasses but when I try to use them nothing happens. any suggestions?

I just finished that level and it was strange. You have to add the trowel to the bucket to make the bridge. Then place the bridge on the supports. Then the planks go in front of the bridge. Hope this helps.

Im stuck on level 19. I have all rooms completed but it wont let me finish the level, I dont know what to do, I have wasted about 4 lives with all rooms finished