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Honestly it's pretty tricky. The other answers have good info but I thought I'd add a tip: Once you think you've found the correct angle, you can use your thumb on the back of the blade as a guide...
Answer
Honestly it's pretty tricky. The other answers have good info but I thought I'd add a tip: Once you think you've found the correct angle, you can use your thumb on the back of the blade as a guide...