Reassemble Diffuser with Flipped Seat

What happens here

After flipping and reinstalling the seat in the diffuser, thread the diffuser back onto the spray gun. Remember to pull and hold the trigger throughout the tightening process. First, screw it on by hand until snug, then use the crescent wrench to firmly tighten it. Ensure the trigger is held until tightening is complete to prevent damage to the ball and seat. This completes the 'first' repack, which costs nothing as no new parts were purchased.

Goal: Reattach the diffuser with the flipped seat to the spray gun, tightening it with a wrench while holding the trigger to prevent damage.