With this schooling online video you will notice how you can change the spring set of an RPE Series actuator. This movie need to be utilised at the side of the Guidance provided inside the IOM handbook that is readily available for download within the Bettis RPE Series Web page. https://pressure-gauge-401593.wizzardsblog.com/14431949/pneumatic-actuator-types-things-to-know-before-you-buy