Another vote for the iron.
I have used the iron on a 314 with no ill effects.
Here's the process. Get the iron hot and then lay a thick towel over the ding. Iron the spot with just the tip of the iron and for a few seconds at a time, always keeping the tip moving slightly. The whole process is maybe a minute or two, and that's taking time to check the ding in between heatings.
LWW
				
			I have used the iron on a 314 with no ill effects.
Here's the process. Get the iron hot and then lay a thick towel over the ding. Iron the spot with just the tip of the iron and for a few seconds at a time, always keeping the tip moving slightly. The whole process is maybe a minute or two, and that's taking time to check the ding in between heatings.
LWW
 
 
		 
 
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