Once you have changed all three springs, thread the bolts back in by hand.

Be VERY CAREFUL, these are thin-walled bolts that can strip very easily.

Use a torque wrench and tighten to 16 lbf-ft (22 N-m / 3.0 kgf-m). Do NOT over-tighten as the bolts will break.

Once all bolts have been torqued to spec, row through all gears and confirm everything feels right. The forward and back motions (1st to 2nd, 2nd to 3rd, etc) will be noticeably stiffer and direct. This is normal, the springs will require more force to move due to the increased length.

Check for leaks after driving, if all is good, enjoy!