Repairing flipping chrome mirror

Pretty much. Some of the earlier mirrors mounting points are really thin. Hard to drill n tap. 71-72 mirrors have a wider stem that is easier to drill. On the smaller stems I typically use a #4 threaded rod with an internal Allen head to alleviate over tightening the threads into the pot metal.

 

Then use a nut n lock washer to secure You can use an over sized washer to adjust the pressure to add tension to the mirror head On the larger stems I can usually use a #6 or 8 screw It’s a gamble drilling these mirrors. Not much room for error and poor metal quality is a gamble