Most sergers/overlockers will come with a tool kit including a small flat blade screw driver and a set of tweezers. Both are needed to change a needle along with a steady hand and glasses in my case.
Turn the flywheel towards you until the needle bar is at highest point. If you can, swing the pressure foot out of the way or remove it. Ditto the upper blade, if you can swing it up and out of the way to give yourself plenty of clearance.
Then using your small screwdriver, gently turn the needle screw a half turn at a time until the needle is loose and drops out. NEVER undo the screw all the way out, just enough to get the new needle back in.
Most needle bars will hold two needles with two screws so getting both changed is a bit of a fiddle, I usually slide the new needle up into the slot, then hold it up into the housing with my tweezers while I tighten up the screwdriver. Or I'll hold the tip of the needle up in place using a long fingernail while doing up the screw. YOu may find you need to slightly undo the left needle screw in order to replace the right needle as the two needles sit alongside eachother in the housing very closely.
On most sergers the two needles sit at different heights so have a good look before you remove and then make sure you get the new needle back up into the housing all the way. Always test by winding through a stitch manually just to make sure the needle is clearing your loopers afterwards.
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