Changing or Putting new line on the DeWALT 20v MAX String Trimmer DCST920 is pretty simple to do. Getting the new line, preferrably DeWALT brand is best. I would expect that other brands will work as well if they are the right size. Let me know if you find that is the case.
Check out the blog post and links:
http://www.tagnaples.com/dewaltstrin...

0:00 Getting started taking out Battery
0:35 Taking off the spool
01:30 Installing first line
04:30 Installing second line
06:21 Putting spool back on
07:30 Cutting the extra line

Check out these videos of some other DeWALT Products I did:
DeWALT 20V MAX Brushless String Trimmer DCST920P1 Unbox and Field Test
   • DeWALT 20V MAX Brushless String Trimm...  
DeWALT 20V MAX Grinder Unbox and Field Test DCG412B
   • DeWALT 20V MAX Grinder Unbox and Fiel...  
Great Buy DeWALT 20V MAX Circular Saw Unbox and Field Test DCS391B
   • Great Buy  DeWALT 20V MAX Circular S...  
Cordless Blower Comparison DeWALT DCE100B and DCBL720P1
   • Cordless Blower Comparison  DeWALT D...  
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