[GreenKeys] M28 skintight motor questions

[Jim Haynes]

Some years back a friend and I replaced a lot of M28 motor bearings just
to get the motors to be quieter.  It was pretty easy, just pull off the
end bells, and pull off the bearings with a puller, took them to a bearing
store and got replacements.  The replacements happened to be the sealed
kind so the presence of oil holes was irrelevant after that.