Remington Hedge Trimmer

This is a Remington 18-inch

First clean any accumulation of dirt and dried on SAP. I like to use a spray WD40. Open wide and set in a vise. Take a file of medium to fine and refine the cut surface by mimicking the diagonal cutting angle and with a little pressure to retrieve the file from the common point of the mower. Very important not to place the flat side. You may want to wear gloves. Sharpen repeating this motion to within the joint to the tip by pulling file for you. Remove from vice and the rotation of the blade of others. Normally 3 to 4 times should do it, I do not know how dull is your hedge trimmer. Remove from vice and carefully close the mower, a little WD40 never hurts and prevents it from getting dirty and rusty. Tighten the nut if necessary. Test. Repeat if it is still dull.