take stater off get new rope if old to short find hole where rope go in tie a not heat the not with a match pull tight take rope and wind the spring up about 4 truns let spring pull rope in to stater reconnect to pull if spring not pull rope in make a loop inside cover wind spring one more trun
you would take off the cover and expose the recoil spring/shaft then detach the string and put the new one on
String got under shaft
pop the spool out wind string in direction of arrow, replace
http://72.3.225.179/manuals/545117526e.pdf
On most of them you hold the top part with one hand and turn the bummer/spool clockwise (looking from the top)and pull it straight down/outward
Trimmers, Weedeater, Weedwhacker, String trimmers.
get a new one
http://www.stihllibrary.com/pdf/trimmerheads/AUTOCUT_25-2_101001.pdf Go to this link and all the string replacement guides are there.
To thread a weed eater is very simple and easy just takes a few steps. First you have to get the string and tie a knot in one end and then wrap it around into the other end of the weed eater and replace then cover then it should be go to go.
Unplug the weedeater from electrical source. Turn the weedeater upside down and remove the black knob on the bottom. If the black knob won't come off you can carefully use a large pipe wrench and turn it counter clockwise to loosen it. Be careful not to lose the slotted metal ring between the black knob and the trimmer spool. Remove the spool and clean it off. There is an arrow showing you where to insert the string. Start pushing the line into the spool going counter clock wise. Be sure to use only .065 ROUND string. Put the spool back on the spindle yellow side up. Hold the slotted metal ring with the slot facing up. Insert the string into the bottom of the ring and put the ring in the recessed circle on the spool, (yellow side). Pull the string over the slot and hold it there. Screw the black knob back onto the spindle, making sure the string is in the slot on the metal ring. Tighten the knob. You are now ready to go.
remove head pull shaft out
you pull the plugs and spray generous amount of W-D 40 in.