Need file for F# string

Hi, this my first post, my name is Bobby and I've been playing bass for 30 years. I'm looking to tune my bass to drop f# on my Ibanez ATK305 5-string. I'm going to be adding an f# string (.165) in place of the b string. Can anybody tell me what files to buy so I can file the nut and the bridge saddle on my bass to accommodate the f# string? Thanks in advance.
 
At the hardware store, look for a 5/32" Chain Saw File. These are the small round files used for sharpening chain saw blades. The 5/32" size measures about 0.160". You can easily use it to file a slot to fit a 0.165" string.

While you are there, get an 1/8" Chain Saw File for the B string.
 
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