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The manufacturers instructions should include the blade size for your weed eater lawn mower.
Yes, well if it gets blunt... Why shouldn't you?
The opposite direction that the blade rotates. In this case I would say counter clockwise but their should be a marking somewhere on the mower that shows blade rotation direction.
A Razor, a lawn mower, and a rollerblade all include a blade. A razor has a blade. A lawnmower has a blade A rollerblade has no actual blade but it has the word blade in its name.
Its yours how should we know?
How do you change the blade on a Toro 21" self-propelled mower
Usually a short length of 2x4 can be used to wedge and hold the blade to loosen the bolt.
If you have not broken the plug or hit the blade on something and bent the blade you should be fine.
What is better a high lift lawn mower blade or a low lift blade.
The Yardman Series push mower uses a 21 inch blade.
The blade
To remove the fastener that holds a mower blade on, turn the fastener in the direction the blade rotates to cut the grass. Look at the blade, find the "leading" or sharp edge, and, while holding the blade, turn the fastener in that direction. There is a good reason that this is always true. It has to do with the physics of the machine. Imagine the fastener being "held in place" to stop it from turning as the machine starts. With the machine starting to turn, the fastener will tighten. The last thing you want is to have the fastener become loose when the machine is running. The blade could kill or injure someone if it came off. That's why the fasteners that hold the blades on these machines always come loose when turned in the direction the blade rotates.