What would be the best seal for the motor - teflon, rubber, metal?
Duratrax, Acer etc. etc. do flange bearings in 5 x 10 in difference seals.
Only thing I could find in 5 x 13 was this
http://cgi.ebay.com/Rc-Screwz-5x13x4...1%7C240%3A1318
Thinking of giving these bearings a try
Rubber Sealed
http://cgi.ebay.com/Rubber-Sealed-Be...1%7C240%3A1318
Teflon Sealed
http://cgi.ebay.com/Teflon-Sealed-Be...1%7C240%3A1318
Or even these
http://cgi.ebay.com/5x10x4mm-FLANGED...1%7C240%3A1318