Question on cones....
So, as recounted elsewhere, I found my rear hub had oodles of play and the cone on the drive side was very loose. On inspection the cone's bearing surface was corroded so I cleaned it up, and re-adjusted the cones, but taking out the play correctly as per Park tool website meant for a very notchcy, and tight, bearing - riding it felt like riding through treacle...... loosen off til it runs smoothly means 2mm play and a lot of rumbling noises. At first I thought it was just the cone was damaged, but today, having replaced it, there is still some notchyness there, tho not as bad. So I guess the bearing surface in the freewheel hub and/or the balls are damaged too, unless someone can say whether this is normal. Loathe to get a new hub until I am sure its really foobar'd.
Invacare Spectra Plus electric wheelchair, max speed 4mph