Otto, That regulator operates his windshield - opening and closing. Not related to wipers.
Nick, Thanks for coming back and providing your pictures and description of the work.
Just a question, but perhaps the JB Weld needed more cure time before drilling???
If you need to do it over, maybe add more JB Weld to that outer casting surface area and don't remove it all down to the original casting. That way it could act as an anchor for the material still filling the hole???
