Centering insert for LED lamp in grave candle

1. Central Sleeve (Socket)

This is the heart of the project. It is a vertical cylinder with an internal diameter of $37\text{ mm}$.

• Function: Holds the LED insert vertically.
• Why this way: The height ($15\text{--}20\text{ mm}$) is chosen so that the insert does not "wobble" sideways, which often happens with flat washers.

2. Stepped Shield (Ring System)

This is a horizontal part resembling a shooting target or a spider web. It consists of concentric circles with diameters of $55, 75, 95$ and $115\text{ mm}$.

• Function: Adapts to the width of the grave candle.
• Operating principle: The outer rings rest against the walls of the grave candle, forcing the insert to be precisely in the symmetry axis of the vessel.

3. Weakening Grooves (V-Grooves)

This is the most important "mechanical" element hidden in the code. A shallow channel is cut into each ring from the top.

• Function: Controlled material fracture.
• Advantage: Thanks to them, you don't have to measure anything or precisely cut with a knife. The plastic at the groove is thin enough that with a little force (pliers or fingers), the ring breaks perfectly along the circle.