Both GrassGator models 3600 and 4600 follow the same instructions for the blade changes:
The instructions on how to remove the head depends on how the head was installed originally.
Right on top of the original head there should be a metal collar with a hole cut on top. Use the tool that came with your trimmer and drop it down the hole. If yours didn't come with one you can use a nail, hex wrench or drill bit. Turn the head a few times until the locking tool aligns with the hole on the plate inside the collar. The tool will sink a little bit deeper and the head will offer some resistance once you try to turn it opposite to how it normally spins. Remember, most straight shaft trimmers are on a reverse thread so try unscrewing the head to the LEFT first.
Right above the original head there should be a plate or metal collar with a hole or u-shaped slit cut on the side. If your deflector shield covers the plate, look for a hole on the deflector shield. Your trimmer may have come with a tool to lock the shaft (usually a metal rod). If yours didn't come with one then use a nail, screw driver or hex wrench instead. Insert the whatever tool you are using into the slit and turn the head a few times. The tool will sink deeper and the head will offer some resistance once you try to turn it opposite to how it normally spins. Remember, most straight shaft trimmers are on a reverse thread so try unscrewing the head to the LEFT first.
Finally, some brands like Weedeater have what looks like a pot metal "nut" right on top of the original head that wraps around the handle of the trimmer. If that's the case with yours then hold the "nut" in place, don't let it move.
Now that the shaft is locked you can unscrew the GrassGator head. Once the shaft is locked, the GrassGator will work as a wrench on that recessed nut or bolt.
The GrassGator head consists of two halves. One half has pins and the other one has holes to accomodate the pins. To open the GrassGator head and expose the pins just pull on either half and it should come apart.
Install the new blades on the pins. Doesn't matter which side is facing up (flat or beveled) as long as all the blades are looking the same way.
Close the head, make sure all the pins are completely inside the holes and screw the GrassGator head back onto the shaft.
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