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There is a hole just above the grass trimming head that you can slip a screw driver into. Turn the head so that the inner and outer holes align where you can put a screw driver or other hard steel object in. Put it in there and then turn the head counter clock wise until it comes off, it may take a little effort to get it to move, but you should be able to do this with your hands. Once you get the trimmer head off, put the blade on and hopefully you still have the nut and washer accessories to hold the blade in place. You will need to place your screw driver back in the alignment hole to hold the head from spinning while you tighten the blade nut back down. Make sure it is tight, you don't want that blade coming off at ~10,000 rpm!
In your manual under section 12: Line Head Installation. You will do the opposite of what it says here. The key is to LOCK the gear drive so the flex-drive shaft won't turn WHEN you are removing the trimmer head. They use a special tool (maybe you have it). But a small-shafted Phillips screwdriver or the like can be put in the drive hole to lock the gearing up as well. Look for the hole in the upper plate and align with the notch in the drive housing and grasping the entire string head unit, remove it. Here is your manual, see Section 12
You can wrap a rag around the threaded end of the string head shaft after removing the bump knob to hold in place while turning the upper part of the string head counterclockwise to remove. Then you can do the same to remove the metal shaft adapter nut above that, exposing the flex shaft in its entirety.
Go to homelite.com then click on service and support, then click order parts then click launch homelite parts catalog, Agree to terms then click continue under model no type in mightylite then find you trimmer in list.
Use a large pair of pliers to hold the turning metal ring above the T35 trimmer head. I used a medium-sized pair of Channel Lock pliers. Then, turn the trimmer head counter-clockwise and it should unscrew from the mount. There's no need to open the trimmer head for this operation. Then, follow the parts diagram in the trimmer user manual to install the blade parts in the right order.
If you go to www.homelite.comin the red area up top click on order parts then click - click to launch homelite parts catalog, then scroll down thru agreement and click agree and then you will need to know your model number and you can get a breakdown of your trimmer wich will give you a good idea of how your machine is put together.