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If this is in fact an Echo SRM 210, then a manual is linked below.
Nylon
The Weed Eater Electric Trimmer is one of the easiest to use
A line trimmer, also known as a string trimmer, is used to trim grass or weeds. The piece of equipment also goes by the name of a weed eater, or weed whacker.
The manufacturers instructions should include the blade size for your weed eater lawn mower.
http://lawnandgarden.manualsonline.com/manuals/mfg/weed_eater/545117526.html?idRes=15826863 This link should let you obtain the manual for detailed instructions with photos.
0.080" per 1993 manual
Drain plug is next to the blade Place a ratchet head into the square plug and drain oil Replace plug and replace oil
The Weed Eater brand of trimmers have very few spool tangles
You can get them at Home Depot, Lowes, and some small repair shops.
How easy is it to replace a spark plug wire on a gas weed eater?
i bought a weed eater used so i dont have the manual and the last owner told me that the trimmer doesnt need the mix of gas and oil i wanna know if that is right? thank you for the help...