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Is the thread feeding freely from the spool? Sometimes thread can get caught on something on the thread spool which causes it to snap at the needle. I suggest unthreading, and running your finger around the rim of the spool to be sure there is nothing for the thread to catch on. Then be sure to use your spool pin disks to ensure the thread is feeding well.
An auto feed line system will do just that and if too much line is released there is usually a cutter inside the edge of the plastic guard covering the string head. I use a Troy Built head on a 32 craftsman and I unscrew the bump knob ...twist and pull out the spring loaded spool....cut a lenth of line 6-8 feet or so....thread the two raw ends thru the two holes in the inner spool....pull them out until they are even with each other....then grasp each one and hold them side by side and wind them onto the spool in a clockwise manner. This is how I do the string head with a split boom that fits the 32cc Sears Power head (an older Troy Bilt).
Remove cup from bottom of unit by depressing 2 detent tabs and pulling away from unit.
Replace empty spool with new full one or wind on aftermarket string. Wind in direction of
arrow on spool. Make sure spool is seated on rachet firmly.
You need to start from the beginning of the trimmer string. Remove the entire spool. Insert the start of the line through and wedge it into the little groove to keep it from coming loose. Now wind the line tightly and neatly in the direction shown on the spool. (it should provide an arrow stating to "wind this way". As you near the end of the line, keep it snug and push the end through the hole where it leads out to the cutting zone. As you re-insert the spool into the housing, make sure it stays tightly wound as you lock it into place. This should help. Usually when your string is too short, you tap the **** of the spool on the ground to advance the line. It should feed a bit at a time, and when you hear it getting cut off, you should stop advancing the line.
Hope this helps.
Check the thread spool to see if there is a nick where the thread is catching. If there is, you can smooth away the nick with an emery board, or just flip the spool so the thread is feeding from the bottom of the spool.
Sometimes the thread feeds too quickly from the spool and puddles around the spool pin. A thread net (can be purchased online or at a sewing machine dealer) can eliminate this.
Check the threading to be sure it is correct - always thread to top thread with the presser foot up.
Check the bobbin to be sure the thread is feeding from the bobbin spool in the correct direction and through the correct guides.
Refer to your manual for threading and bobbin position.
The thing is with strimmers, mower etc. Depending on which direction the designers have made it spin, they normally have a 'reverse' threaded, head. Simply 'Tighten' it up to remove, and 'undo' it, to tighten. Et voila! Happy strimming:))