SOURCE: I have a Echo Gas trimmer SRM-210 Rapid feeder
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
http://dl.owneriq.net/8/854215d5-44e4-4b5d-b773-77b331fd73b3.pdf
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