Those round 4in lights are secured either by small screws under the lens, or the have spring loaded tabs that hold them tight to the ceiling, either way if there flickering they need replaced, in another post I made I left contact info for a guy who has these lights for 10.00 a piece.
RV
Supplies
Owner: Kevin Wurm
Ph:260-417-4098
kwurm312@yahoo.com
www.kswrvsupplies.com
@-bay:rvsupplier312
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