201630’ classic Kohler shower valve issue
Yup. It’s a) stupid and b) par for the course.
You need to carefully enlarge the hole in the Fiberglas shell just enough to pull the cartridge.
Search the forums for some methods.
Rich, KE4GNK/AE, Overkill Engineering Dept.
'The Silver HamShack' ('07 International 22FB CCD 75th Anniversary)
Multiple Yaesu Ham Radios inside and many antennae sprouting from roof, ProPride hitch, Prodigy P2 controller.
2012 shortbed CrewMax 4x4 Toyota Tacoma TV with more antennae on it.