[bowley]

Thanx Kevan ive never used tubing over axle before but now i know how ill use it on driveshafts too.

[Kevan]

I prefer to call it axle in tubing as you put the axle in the tubing rather than the tubing over the axle.

[bowley]

Another axle question. Does it make diference using calaberated ,rectified ballanced etc axles or using titanium carbon fibrd . Or is a normal axle good enough.

[KensRedZed]

That depends on what type of racing you do.

Having a race with a few friends or family members after dinner usually doesn't require a huge budge or special parts. Standard axles will usually work quite well.

Breaking the sound barrier or the speed of light requires a few upgrades like better axles, wheels, tires, motors, etc.

Racing in a competitive club requires even MORE upgrades. Especially when it's all about winning. 

[Kevan]

I use drill blanks but have used 3/32 piano wire and when I could get them mold tool ejector pins.

As long as the rod is straight and fits inside the brass tube and a decent fit in the wheels it'll be fine.