When you want to get the old one off put the left side (in the above pic with pointy finger) against a wall and it will help hold the wheel in place so you can really get some weight behind the wrench.
@Clockwise started
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When you want to get the old one off put the left side (in the above pic with pointy finger) against a wall and it will help hold the wheel in place so you can really get some weight behind the wrench.