You have to take the hub off(like you were putting on more line). You will see the problem immediately.
SRM2301
Sure you can. If they're not of the same or compatible mfg., displacement and arrangement - use bailing wire or duct tape. You must not though, put an Echo trimmer on a cractsman's carcuarator.
I use .155" for my push-style trimmer (Echo Bearcat). I'd like something thicker, but haven't yet found anything.
The best electric string trimmer based on the consumer report is the Stihl FSE 60. They say it can handle as tough of weeds as any gas trimmer but you do have to contend with the chord. For a 2 stroke string trimmer, the best one is Echo SRM-225. It is light and tough on weeds.
Since you didn't tell us where exactly you are, we can't figure out what "the closest" would be.
If this is in fact an Echo SRM 210, then a manual is linked below.
4
Black and Decker is one of the best lawn trimmers available with proper care they can last a lifetime.Another good brand too check out would be Toro - Electric Trimmers.
You can find reviews of Weedeaters at Consumerreports.org and consumersearch.org. Galt.com has their trimmer buying guide at http://www.galttech.com/research/household-DIY-tools/best-string-trimmer.php.
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Under the dash, on the passangers side.
It is the resistor, replace it.