So, I went to the local UW photo/video shop to ask for information about the Nauticam L10 housing. They don't have it in store and have to be special order.

Anyway, I was trying to get quote to put together the system. Even though it's a N50 system like the Nauticam LX100, I was told the short port from the LX100 housing won't work, and I wasn't given a reason. Instead, they told me the Nauticam L10 short port is either the Short Port 22 or Short Port 25, which none of them allows 67mm wet lens! So you're force into the bayonet mount system. There is no bayonet mount to 67mm converter. Therefore, you now have to spend extra $1400-$1700 depends if you get the WWL-1B or WWL-C.

My questions is, those who have the short port for Nauticam LX100, can you find a L10 housing and see if it works? My LX100 short port is permanently fused with the housing so I can't remove it.

If you look at the port charts, they list short port 22 and 25 for both the LX100_II and L10 and they can zoom to either 30 or 40mm respectively on both cameras while the standard port zooms to the full 75mm.

You mention your LX100 port is fixed to your housing - presumably that is a type one LX100? - which it seems also had interchangeable ports, so presumably that short port is discontinued You say you can't get your off the LX100 housing? Have you tried a strap wrench?

What are you trying to achieve, are you looking to use an M67 wet lens other than a WWL? There is the Nauticam bayonet adapter:

https://www.backscatter.com/Nauticam-Bayonet-Mount-Adaptor-for-SMCCMC-Lens

which says it works for SMC/CMC/MFO M67 lenses, though it may not end up with the right spacing for other wet lenses.

Looking at the M67 short port it mentions there is no zoom, so it may be shorter and not allow you to zoom in or perhaps the L10 lens protrudes a little more at minimum zoom.