For best practice you should be looking to change the cutter blade on your lawnmower before it dulls to much, as dull blades will increase wear on the mower engine and will give the grass a ragged, torn cut resulting in unhealthy for the grass.
GENUINE HONDA 19" ROTARY BLADE 72511-VE0-N00, FITS HRB475, HRB476- FREE DELIVERY
2x Genuine MOUNTFIELD Lower Handle Bar Fits HP164 SP164 SP414 HP414 381006769/0
Genuine MOUNTFIELD Lower Handle Bar Fits HP164, SP414, HP414 - 381006769/0
1149009 - Genuine Replacement Lower Handle
Genuine Mountfield Lower Handle Fits SP164 & HP164, Part No. - 381006769/0
Honda HRX476HY 19" Wheeled Hydrostatic Petrol Lawnmower