Anti swivel collars are needed on the Made in China or Hydro cylinder to prevent rotational movement when a Smart reflector and sensor are installed. Rotational movement of the cylinder causes errors with Smart. Install an anti swivel collar on each end of the cylinder.

On the Ab Back, Leg Curl and older Leg Press the cylinder is bolted on and the mounting area is small. A narrow anti swivel collar makes it easier to install the anti swivel collar and you will not need to bend the cylinder mounting brackets.

There are two types of anti swivel collars

The narrow size is shown here

Click here for the wide collar .