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Mount the O-ring in the groove on the seal housing. Do the same on the other seal housing.
Mount a spring ring on the trigger rod. Mount the spool on the trigger rod. Mount another
spring ring at the other side of the spool. Mount the lock for spring ring on the trigger rod.
Mount the spring and the spring retainer on the trigger rod. Finally mount the seal housing
on the trigger rod. Mount the trigger unit through the valve block.