One vent knob wobbled, set screw was stuck and not seated. Bought new ones and their set screws were stuck! So here are the steps to fix the original one.
1/16" drill bit to drill set screw. Then 5/64" drill bit, in reverse, and set screw backed out. Local hardware store had correct set screws, 6/32 nd. Ran 6/32 tap to clean up knob threads. Hope this is useful information. Doug 20220312_163134.jpg
1/16" drill bit to drill set screw. Then 5/64" drill bit, in reverse, and set screw backed out. Local hardware store had correct set screws, 6/32 nd. Ran 6/32 tap to clean up knob threads. Hope this is useful information. Doug 20220312_163134.jpg