Horse chestnut wood, while beautiful, can be challenging to work with due to its tendency to warp or become unstable over time. If you're struggling with a wobbly or uneven table made from this material, here are the most effective solutions to stabilize it:

1. Check and Tighten Joints: Loose joints are a common cause of instability. Use wood glue and clamps to reinforce any weak connections, or consider adding corner brackets for extra support.

2. Level the Legs: If the table rocks, place it on a flat surface and identify which leg is uneven. Sand or trim the offending leg slightly until the table sits firmly.

3. Add Cross Bracing: Installing a cross brace between the legs can significantly improve stability. This is especially useful for larger tables.

4. Use Epoxy for Cracks: Horse chestnut is prone to cracking. Fill any gaps with epoxy resin to prevent further weakening of the structure.

5. Apply a Stabilizing Finish: A high-quality wood sealant can reduce moisture absorption, which often leads to warping.

For long-term durability, consider combining these methods. With proper care, your horse chestnut table can remain sturdy and functional for years to come.