In the previous puzzle, the tweak tool was used to rotate a helix. In this puzzle, the tweak tool is used to "flip" a sheet. This turns the sheet over and moves it over a bit. In this case, flipping the sheet will hide the two hydrophobics in the core of the protein. This puzzle can be a little touchy, so you may need to reset and try again a time or two. As a first step, shake the puzzle to clear up some of the starting clashes. After shaking and wiggling the bad loop, try shaking and wiggling the entire protein. This should allow you to finish the puzzle.