TLDR: Use a 1/2" deep socket, red Loctite, and torque to 25-30 ft-lb

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There are a number of reasons you might want to change your axles: maybe the threads got damaged, maybe you're looking to try a different hanger width. Either way, the steps to replace an axle are the same. The following steps show the process done while setup on the board - I find this easiest for most folks since not everyone will have a good way to hold the hangers without damaging them in a vise. 

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1. Remove wheels, axle spacer and axle nut. I also recommend wiping off any grease or oil.

2. Using a propane torch, apply heat to the axle you are removing first. ~15s is generally enough to get the Loctite that's in there to loosen slightly. 

3. Using a 1/2" deep socket, loosen and remove the axle. 

4. Clean out the hanger threads with a cotton swap. Goal is to remove any leftover, dried thread locker.

5. Apply a couple drops or thin line of red thread locker (we use Loctite 272) to the large threads on the axle

6. Hand thread the axle into position

7. Using a torque wrench and the same 1/2" deep socket, torque the new axle to a minimum of 25ft-lb. Up to 32ft-lb is totally fine, but can be difficult to achieve on the new ultra narrow axles. More on that at the end.