Somebody are afraid of electrical connections of model kits. If they have more lights, you have problem to connect. Because the link is so fragile, the light will flicker.
So I solved the problem by using:
heat shrink (available in many sizes for your purpose).
hot air gun. I don’t use lighter because it burn your skin. Hot air gun made heat shrink tubing.
I used the heat shrink that came with Cathys Flower house. I thought I heated enough but they are still flickering. This was an issue with my Chocolate shop one as well but did not have the heat shrink, just the tape. Unsure what I am doing wrong. I make sure they are twisted together well but the wires are so fragile coming from the LED