1. Do steps 1 to 5 of The Beaver.

2. Pick up the strings marked X on the back of R5 (fig. 28a), and drop all other RH loops.  Rotate R5 half a turn toward you.

3.  R1 and R2 remove TV strings from L2. L1 and L2 pass between the former TV strings from below and spread them apart (fig. 28b). 

4.  R1 picks up the L1n string from the near side after it passes through the central loop.  R2 picks up the L2f string from the far side after it passes through the central loop (fig. 28c).  You have formed The Closed Door (fig. 28d).

5. To open the door, drop L5 loop and extend