by Florida_Slotter » Wed Feb 06, 2013 3:00 pm
Harry,
The rear axle tube is a piece of 7/32 round brass tubing from K&S Engineering. I cut it 1.100 inches in length. After soldering it in place, I place an FC130 motor in place and then mark the opening to cut with a Dremel tool. When I complete cutting the piece out, I clean it up with a file.
Since the tubing is 7/32 inches in diamter outside, the inside is 3/16 - the same dimension of a commercial slot car raceway bushing or bearing. I like using Avid ball bearings. They cost $1.00 per bearing. You can find them on the Avid site.
At that price, I find it more economical to use the bearing. I do not think it makes the car any faster, it just keeps the car more consistent for a long time.
If it would help, perhaps another step by step would be in order?