Did the pushmower maintenance, spark plug, air filter, grass cleanout, bolt tightening. 2nd year doing my own blade sharpening and balance. Had some considerable grinding to do, since I have a habit of mowing my neighbor's grass when it gets high and last year I forgot yet again about the exposed ground rod that I blitzed over.
Had to borrow my father-in-law's grinder since I don't have one yet. Worked through the damage in the blade. Then did several passes with a flap disk. Once things were looking good, started the balance portion.
Mounted the balancer to a 2x4" leaning against the bench with some angle aluminum and clamps. Used a level to make the 2x4" vertically aligned. Pulled the mag bearing to the blade and saw rotation when I let go. I marked the heavier side with painter's tape to know which side to flap disk. Did several passes, rinse and repeat. Was able to get the blade balanced. Would love to design something more clever to mount the balancer to the workbench, but takes up less space.
Noticed that the operator presence bar is not springing back as much as it did in the past. Lawnmower still stops but looks like I have something to try to figure out.