It wasn't that the fix was hard, but that the process was so maddening. The existing shower drain hole was just the wrong size for everything period. It's a shower drain circa the late seventies that had a home style fixture originally installed. It long ago disintegrated into crumbling green shards during its final decent into darkness. The associated pump had long since passed away, and the hoses were desiccated and in a state of rigor mortis. These were the easy things to replace. The drain fitting, not so much.