Hi Aiden,
Just read your post and looked at your images; your first one shows that the tea-light is sitting directly in the hole you've made in the wood and is also a very 'tight fit' with the wood. Am I correct?
If so, I politely suggest you have a read of some very good posts on this forum that contain very helpful H&S advice and guidance about fitting tea-lights and candles into wooden products in a safe and practical manner.
Use the Search facility and "What price safety" and "H&S in our products" for starters.
If I'm wrong with the image, my apologies.