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.

There are two types of anti swivel collars

The standard wide size one is shown here

Click here for the narrow collar used on the Ab Back, Leg Curl and older Leg press.