Simply Slide Over the Handle, Put the Top Piece Over first and then the Bottom. Make Sure the Side with the Higher Curve at the bottom faces the back of the leaf blower. push it to the bend in the handle right before the trigger to lock it in, and Push it Back over the trigger to store it on the back of the handle when not needed. You may need a Piece of Electrical or Duck Tape over the top as shown in the photo, it ended up not putting enough pressure on the button without it, but the tape also gives the Plastic Grip to stay over the button and never accidentally slide around. May also fit other models.