JBI Suspension shares the best way to assembly a WP Conevavle cartridge, WP XACT Pro 6500 Cartridge and a WP Xplor Pro 6500 Cartridge to ensure no air is captured inside the damper assembly.
JBI Spec Xact Pro 6500 Cartridge Kit
https://www.ridejbi.com/jbi-spec-wp-xact-pro-6500-...
JBI Spec WP 7548 Conevalve Fork