Tail wheel
I've been using these $5 tail wheels because they are the lightest and cheapest I can find at 10 grams. $5 delivered ain't bad either. The problem has always been the spring system that they use for steering doesn't work well. This time I thought I'd try a different way. The plastic tube has a 1/8 inch inside dia. It slips back and forth to eliminate binding. The CF rods drilled into the rudder are 1/8". The steering is very positive now. I've had this king of tail wheel on my Integral for 2 years and it is very strong.
http://www.dollarrcparts.com/cam-0004.html
The nylon screw on the tail wheel is a 1/4x20 and I tap it and screw it in. It's very snug and doesn't require any glue which makes it easy to replace if needed.