[bmheise]

While waiting for the new dial for my 37-640, I thought that I'd grease and lube all front end moving parts.  
I noticed that it didn't appear that the tab on the dial guide paper was ever used as described. I did notice that the card stock was slightly warped so I pressed the guide into a book for the apparent weeks it's going to take to receive the replacement dial from RadioDaze.

After repairing someone's old damage to the vernier dial mechanism, I temporarily put the old dial back on, forgetting to reinstall that guide  and learned that the band indicator linkage jams right into the old, but still straight phenol dial when operated.

In addition to keeping the dial from touching the case, I'd say that the other feature of protecting the dial from moving parts is just as, if not more important. The old dial, as would be expected, did in fact chip as a result of that contact.