I've been fairly happy with the Ryobi brand but this is starting to p'''' me off. I've gone through two of the blade assemblies (p/n 311826001) and two of the center gears (p/n 610114001). I've ordered the center gears with no issue, but it's the blade assemble drive gear that needs to be replaced. Does anyone have a lead on the gear for the blade assembly? Thanks.