I have a slight mounting problem with my lights. They jiggle. A picture is worth a thousand words so here goes a thousand words(no camera

) I have a stiff, old(80's) front reflector bracket. I bolted a piece of aluminum to this bracket to form a T. I attached a clamp around my PVC lights(2) to an 'L' shaped flat aluminum strip bolted to the top of the T coming off flat.
So: I have a bracket bolted to an AL strip bolted to an 'L' Al strip and lights clamped to each L strip. If this is clear as mud please let me know and I will try and get a pic up. How do I eliminate the jiggle. Thanks