| 
 
			
			Just measured up mine.  The end diameter where the mirror goes is 1/2. But the rod tapers up to 11/16 at the base end.  It’s a pretty consistent taper.  The 13-1/2 is correct
		 
				__________________Jordan Baker
 RHLI Museum,
 Otter LRC
 C15A-Wire3, 1944
 Willys MB, 1942
 10cwt Canadian trailer
 |