RE: Changing bearings
Stan,
As was mentioned, Paul at [link=http://rc-bearings.com/]RC-Bearings[/link] could supply the bearings you need at a fraction of the cost at Tower.
You need the following:
A 6000 bearing (10x26x8 mm) ST number 22123000
A 16004 bearing (20x42x8 mm) ST number 22123002
A 6203 bearing (17x40x12 mm) ST number 22123001 (which I did not find in Paul's site, but I am sure he can get it too for you)
Take the measurements yourself, with vernier calipers, since I read from the web and did not measure them by myself.
All will cost about $12 together... Unless you want to upgrade to ceramics...