- The rod diameter is not so important for firestarting. The smaller diameter wears down faster. I have a rod that´s about 4mm x 25mm on my keychain. A practicing sample lasted for about 80 attempts and is still good.
- I´d remome the cutting edge if it´s on the long side. That´s an accident waitng to happen. I´d sharpen the short side. The amount of wear depends on the pressure. If you think it´s too much apply less pressure.
- The opinion on magnesium is divided. I don´t like it too much. The magnesium block can get wet or crushed without too much damage. That might be an advantage. If it doesn´t work for you , practice more or take some other tinder.
- Make sure the shavings don´t get wet or they´ll oxidize and turn worthless.