This is a part of a mounting system for an Olight pistol flashlight. The universal adapter that they include isn't so universal when it comes to a Canik handgun. I've talked to the people at Olight and their engineers say its made of stainless steel with a hardness of 200. I need to remove 1-2 mm of material off the adapter for a proper fit but I don't know what type of file I need. I think I can accomplish this with a hand file and time with the proper tool. I know that some metals are softer than others, thats why I'm asking. I don't want to purchase a file that won't scratch this hardness but it works wonders on gold/silver or aluminium. I also have a dremel rotary tool if you think that might work better than a hand file.
Any advice would be greatly appreciated. Thanks in advance for all your help