Remove the existing sockets and then get a set of good spring loaded sockets like these http://www.hellolights.com/70w15hqisopa.html and attach them with some screws. The aluminum housing is really easy to get through
problem is, those are kinda hard to find. hellolights doesn't ship to canada any more either. Kind of a shame, since I see lots of cool stuff on there often. I would have just built my own pendant out of bent aluminum if I could only have gotten the bulb clips.
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Everything I put in my tank is fully dependant on me.