About the SpeedLock System

• The SpeedLock cutting head replaces the standard bump head that comes on all Troy-Bilt trimmers. The standard bump head uses a spring attached to a spool. When you tap the head against the ground, more cutting line is pushed out. The SpeedLock fixed-string head uses a thicker, tougher line that you won't need to replace as often. However, unlike the bump-head line, you can't tap the SpeedLock head to get more line if it breaks off.
  
  

Changing to SpeedLock

• Changing to a SpeedLock head on your Troy-Bilt trimmer requires you to remove and replace the entire standard bump head system. Remove the old head with a standard Phillips screwdriver and fit the new SpeedLock head in its place. Changing to this system will only take a few minutes, so if it's not what you prefer, it will be easy to change back to the old system. Personal preference will play a large role in deciding what system works best for you. The bump feed system requires more line replacing, but the replacement line may last longer if you're using the trimmer over a lot of rough areas that break line easily.
  
  

Features of SpeedLock

• The SpeedLock system lets you replace the line without actually taking off the spool cover, removing the spool and rewinding the line yourself. With this system, you just feed the line into the holes on the cutting head. The SpeedLock head uses a .105-inch line, which is much thicker than the .08-inch line that is standard on most Troy-Bilt trimmers. This system gets rid of the hassles of replacing the line manually, but the thicker line may still not be strong enough to finish your cutting job.
  
  

Removing the SpeedLock

• Removing the SpeedLock head is as simple as attaching it, requiring only a Phillips screwdriver. If you decide that the SpeedLock system doesn't meet your cutting needs, you can replace it with a new cutting head or put the original bump head back on. These heads can also be used on other trimmers, provided that the arbor bolt, which connects the shaft to the head, is the same size and gender.