"I had seen YouTube videos of the mechanism not working for so many. Many people even had their own mods. I was building the TV and my fiancé the NES. I told her that as soon as she finished building the mechanism we had to test it out. Well the mechanism was not working at all for 1hr we tried looking to see if she did something wrong in the build but everything was 100% correct as the instructions. Well that's the thing. They should update the instruction manual on page 42 step 49 of the NES. If you notice carefully piece 6331441 at the bottom cross area one side is hollow and one side is flat. Someone recommended on YouTube to flip that piece, and that's when I notice the two sides are different. Center of Mass played a big role here. The way page 42 has it the hollow part would be facing the front of the NES. That will cause the mechanism to not work at all (at least in our case we have 100% failure with this orientation. We rotate the gray Cross Block 6331441 so the flat surface is facing the front of the mechanism. That solved the problem for us and we now have 100% success rate so far. See picture. Other than that this set is awesome, I am half way done with the build, I'll continue in 2 days from now. I never had Lego sets growing up and now at 28 my fiancé and I decided to start buying Lego sets this year and start building them together. I had only build two Legos sets before 2021, I was 25 when I got my first Lego set ever lol I grew up with the super Nintendo but it's still the same nostalgic feeling. Thank you Lego for this set seriously!!!"