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Not really a fix but it worked for me. I opened up the case. Their is a little black box with a red button that must be depressed. Pulling up on the trigger pushes the button. Their is what i call a counter press above the trigger. By pressing it, it makes room for the trigger to slide up and press the red button. There isn't much you can do improve this process. But i took the two springs off the trigger and depressed them trying to shorten them thus reducing the force needed to press. The counter press in spring load. I carefully stretch it by pulling on the end directly above the trigger(not against the frame). This took some pressure off the counter press. I finally took a small file and carefully filed down the edge of the counter press where the trigger presses against. This makes it slide upward easier even if the counter press isn't pressed down fully when you squeeze it. The trick is pressing the counter press first, but doing these things has made my trigger a lot smoother. It use to be a hard press to activate, but now it is 10 times better than it use to be. Good Luck!!
With most trimmers, you may have to push the spool casing inward and then turn. It should unlock fairly easy. You may also want to spray the divider crease on the spool casing with some kind of lubricant like WD-40 or Tri-Flow to facilitate the process of detaching the spool casing from the body. Good luck. I hope this helps.
Black & Decker didn't make it easy to remove the battery pack. You have to push both buttons in at the same time, while pushing the battery pack forward. It takes a little while to get good at it -- you have to hold onto the trimmer with the same hand that's pushing the buttons in, while pushing the head forward with the other hand.
If you're only taking the head off to charge the battery, you can charge it while it's still attached. The hole for the adapter is on the back of the head, so you can plug it in while it's attached to the trimmer.
These are the steps to open the clamshell/motor housing for the Black and Decker 18V Cordless Trimmer Model NST2018. The orange clamshell has two plastic clips that engage two recesses inside the black plastic ring. You use two screwdrivers to disengage the clips and seperate the black plastic ring from the orange clamshell. Follow these steps: Wrap tube assembly in a small towel and mount in a large bench vice securely. You will notice two small openings at the top of the black plastic ring at the top of the orange clamshell. The next steps require two people. Person one inserts a flat-bladed screwdriver into into each of the small openings at the top of the black plastic ring (two screwdrivers). Using the tube assembly for leverage, pry the black plastic ring from the orange clamshell with enough force to disengage the orange plastic clips from the black plastic ring. Person two pulls the orange clamshell/motor housing away from the black plastic ring/tube assembly along a straight line (same axis as the tube assembly). After you've separated the motor/clamshell housing from the black plastic ring, remove the six screws and open the clamshells.