Plumber's granddaughter
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I am in the midst of changing out our Kohler mixer pressure balance kit (regulator & cap Kohler kit #GP76851) but apparently the original pieces were put in place from behind. How do I safely enlarge the opening in the fiberglass surround to allow for replacement from the front? A hole saw cannot be used since the valve cap is in place. Would it make sense to drill a series of holes around a pencil outline or is there a better way?
Here is photo...you can see the metal part is BEHIND the fiberglass. That lays on top of part of the valve unit so the hole needs to be very slightly bigger than the unit to slide out from the front as designed.
The current hole is only 2-1/2" while the valve cap unit is 3". We need to get the hole bigger without damaging the fiberglass or getting too big...the faceplate measures 3-3/4" across.
Thanks in advance!
Here is photo...you can see the metal part is BEHIND the fiberglass. That lays on top of part of the valve unit so the hole needs to be very slightly bigger than the unit to slide out from the front as designed.
The current hole is only 2-1/2" while the valve cap unit is 3". We need to get the hole bigger without damaging the fiberglass or getting too big...the faceplate measures 3-3/4" across.
Thanks in advance!