Okay, I was thinking of some way of spacing it from underneath, but suspending it from the top would work just as well. You could really use any material to suspend it I would imagine. Good ideas.

I will be doing transom lights on my Moomba XLV over the winter. I still have enough materials to make four of the lights with the caster cups. I am going to supplement that with one of the CREE LED drain plug lights. I liked the output of the six lights I had on the Supra, but I only had caster cups for 4. I suppose using the non-cup method, I could make as many as I liked. (for less money too).