Please have a reference of our actuator spring pressure table. Our spring full-stroke displacement is 14.5 mm, the default preload will be setup to 2 nut turns (1.5 mm stroke displacement). You can adjust the preload stroke as the following table and the video.
Please check the following video to learn how to replace the spring of the adjustable actuator.
Now you could adjust it more tightly with preload the rod end as following steps.
Step 1.: Preload
You can preload the actuator rod to get a higher boost pressure. please check the following 2 videos