I make something similar to the OP (at least I think I do... maybe.... based on the description).
In any case, what I make is known as a 'floating candle' or a water/oil candle. Daqc- is that what you are talking about?
If so, I use these for mine:
http://www.createforless.com/Pepperell-Candle-Wick-Floating-Kit/pid265612.aspx I bought them at HobbyLobby. They are cheap (less than $2.00) and they work great.
If that's the kind of 'candle' you're talking about, and you are trying to DIY from YouTube videos, I'm afraid I won't be of much help to you, because I tried to make my own DIY floating wick assemblies as per a few you-tube videos myself, and failed miserably. After my 3rd failed attempt, I found the above product from HobbyLobby, and am so happy with it. It works so much better than anything I tried to rig up, for sure. lol
To make mine, I take a decorative glass container, put some decorative rocks in the bottom, fill it about 2/3 of the way up with water (which I color with food coloring), pour about 1/2" to 1" of olive oil in it, and then I set the floating wick thing on top, just like what is shown in the following video, only I use my own glass container: [ame]https://www.youtube.com/watch?v=HfRmSRTFc_U[/ame]
IrishLass