I fought with my WAV pumps to open the punks. I sold them off with my Apex when I upgraded to GHL. Now there is a tool out there to open the WAV's, and they are offering it as a 3D printed part.
"This is a tool which makes it easy to unlock the impeller assembly from even the cruddiest, most coralline-encrusted WAV.
Recommended filaments: ABS/ABS+, PETG
Infill: at least 40% is recommended for high strength
Top/bottom/wall thickness: =>2mm
Support: maybe; my Wanhao D6 printers handle the beveled edges without any need for support structure; YMMV"
"This is a tool which makes it easy to unlock the impeller assembly from even the cruddiest, most coralline-encrusted WAV.
Recommended filaments: ABS/ABS+, PETG
Infill: at least 40% is recommended for high strength
Top/bottom/wall thickness: =>2mm
Support: maybe; my Wanhao D6 printers handle the beveled edges without any need for support structure; YMMV"