NBTExplorer[github.com]: You'll need this to edit your player file.

Open up NBTExplorer and go to File > Open. Now navigate to your desired modded player file at C:\Users\[Username]\Documents\My Games\Terraria\tModLoader\Players (the file location may vary based on what drive you installed tModLoader on). The file should be named [Insert Player Name].tlpr.

After loading your player file into NBTExplorer, to access the data, expand modData to see the entry folders for each mod that saves player data. Try to find to entry file that contains mod: TF2.

Now expand the data folder. It contains several tags corresponding to an in-game statistic or an internal variable. You can select the edit tag value icon (the pencil) at the top and change the value. Make sure to save your save file when you're done!

There are some tags that can be edited freely, while others shouldn't be tampered with.

Mercenary statistics:

• damage: Damage multiplier
  
• health: Health multiplier
  
• money: Mann Co. Store money
  
• miningPower: Mining power of the Australium Drill
  
• itemDropTime: Timer for item drops (in frames)

Internal variables (DO NOT EDIT)

• totalHealth: Health displayed in the player selection screen
  
• bonusHealth: Health to be added to the base health in the player selection screen
  
• class: Current class; changing this will lead to errors with certain classes
  
• mountSpeed: Mann's Anti-Danmaku System's speed; Should only be changed in-game
  
• homingPower: Mann's Anti-Danmaku System's homing power; Should only be changed in-game
  
• newPlayer: Used to give Spy his Invis Watch