Sue,
The numbers on the dial are just a reference point. It's the spring and disks that actually put the tension on the thread. As long as the tension unit is assembled correctly the numbers can be most anywhere.
Did you read the the instructions in the TSFR manual? It gives super easy to follow step by step instructions on how to adjust tensions.
{
http://www.tfsr.org/publications/tec...machine_manual }
Joe