Chainsaw guide bar roller bearing seal

A chainsaw comprising:

• a power unit disposed in a housing;
• and
• a working assembly powered responsive to operation of the power unit, the working assembly comprising a guide bar around which a chain is rotatable,
• wherein the guide bar comprises:
• a first side plate and a second side plate facing each other and extending away from the housing to a nose of the guide bar;
• a sprocket wheel provided at the nose of the guide bar between the first side plate and the second side plate;
• a first shim disposed between the first side plate and a first side of the sprocket wheel;
• a second shim disposed between the second side plate and a second side of the sprocket wheel;
• a first sealing member disposed between the first shim and the first side of the sprocket wheel;
• a second sealing member disposed between the second shim and the second side of the sprocket wheel;
• a bearing assembly comprising rolling elements and a hub, the hub having a lubrication reservoir formed therein;
• and
• a channel configured to provide a passage for lubricant, the channel extending between the lubrication reservoir and the rolling elements,
• wherein the channel is formed in one of the first shim or the second shim.