Air assist disassembly

Anyone ever take apart their air assist? When i removed the laser from the lo gmill, the wires for the air assist came off anf in order the re attach, i need to get inside the fan .
The nozzle is one piece and looks to be 3d printed and the fan fits in it. I think it should have just slide out after I removed the two bolts but there appears to be something else holding it in.
Any help welcomed and appreciated.

On closer inspection i see that the wires are soldered to terminals under the center “sticker” so i don’t need to pull the fan apart.
I DO need to know polarity although I guess if I create a vacuum I can always swap at the plug end.