That Aquaracer is so cool! Look forward to following the progress when you get to that
I'm putting together a blow-by-blow with my son's WAF2010. My current bottleneck is making a shoe to fit the inside of the case so I can press the new stem tube into it. Here's the case:
Here's the stem details:
Here's the new crown:
You'll notice that hexagonal pattern on the new crown. It actually mates with a hexagonal hole in the crown, pressed by a spring that holds it out. Many crown designs have the hexagonal pattern but it's short enough that it only hooks up with the setting on the crown when it's fully out.