you all could allready know this, i have no idea.-- the sealed bearings-- you get a small pointed exzacto knife, break a little bit of the pointed tip off, then dull the cutting edge - slightly round the broken tip off-- lay a bearing flat on a workbench, lay the knife across the bearing- get the knife under the bearing seal about 3/4 mm. gently pry the seal off. you may bend the seal-- you will get the hang of doing this-- just rebend the seal flat-- main thing is-- try not to nick the rubber sealing edge.- go to wally world- automotive area-- buy a couple cans of -- crc electronic cleaner-- blow the bearing out- get it spinning with the red tube on the cleaner-- let it dry-- regrease- walk the 1 seal you remove on each bearing back on--- 90% of the bearings out there are grade 1. might as well get your monies worth out of them-- higher grade bearings are not cheap-- ones with decent double lip seals cost even more money-- these gas motors have enough power to use thick grease- stays in the bearing longer-- agan, wally world-- Lucas - thick & tacky red grease ---