Enlarging 4-3/8 Inch Hole to 4-1/2 Inches for Optronics GloLight With Rubber Grommet

Question:

I purchased these STL101RB lights to replace old incandescent lights in my RV. The old and new lights are both exactly 4 5/16inch across. However the new Optronics lights will NOT go into the opening. I believe the issue is the ridges inside the recommended grommet, which are making it too tight. What is the best and easiest way to slightly enlarge the openings on a Finbreglass RV with Gel-Coat finish? Im hoping I just need to enlarge that hole by 1/8inch all the wau around to make these awesome lights fit. Optronics GloLight LED Tail Light # STL101RB will not fit 4 3/8 opening

asked by: Derek M

Expert Reply:

The GloLight LED Trailer Tail Light - Stop,Turn,Tail - Submersible - 21 Diodes - Round - Red Lens # STL101RB along with the grommet # A45GB requires a 4-1/2 inch cutout. I recommend using a rotary tool like a Dremel or a manual metal file to evenly enlarge the holes to that size. I recommend drawing the hole side on the RV and then make sure to use fine sand paper or file so you don't take off more material than you desire.

expert reply by: Jason S