Hello all,
I've come across a Nauticam flat port 45 with a damaged M67 thread - it doesn't look great, the thread seems quite crushed and mounting anything is not an option, which is a deal breaker.

However I thought I'd ask for your opinion - since this is aluminium and quite soft, does it look like there might be an option to rethread it?

The pictures are not the clearest, but all I have for now.

thanks!

Looks dodgy. One thought though. Some of my diopters included a M67 "spacer" ring. Perhaps something like that could be screwed on with some necessary force and then left in place to mount other items on the good spacer threads?

Perhaps someone has an unused spacer they could donate?

Example:

https://reefphoto.com/products/nauticam-m67-spacer-ring-for-smc-cmc

Edited July 17Jul 17 by Dave_Hicks

9 hours ago, Dave_Hicks said:

Looks dodgy. One thought though. Some of my diopters included a M67 "spacer" ring. Perhaps something like that could be screwed on with some necessary force and then left in place to mount other items on the good spacer threads?

Perhaps someone has an unused spacer they could donate?

Example:

https://reefphoto.com/products/nauticam-m67-spacer-ring-for-smc-cmc

Yes - I was actually wondering if it might not be possible to rethread it with a spacer ring or filter mount. The issue is the vendor says nothing can be screwed on, and I'm not sure how much force he used when trying.

Very fine treads like that are a problem they can be difficult to start even when not damaged. Yes the aluminium is soft but if you are also screwing a soft aluminium adapter in to try and fix not much happens and there is a risk of cross threading and doing more damage.

The correct way to try to fix this is using a thread file with the correct pitch of 0.75mm. You carefully place the teeth in an undamaged section and carefully move it around the circumference. It is meant to lift and straighten the teeth of the thread. It may be difficult to do with the glass in place though.

The down side of fixing is you scrape off any anodising and it might be more prone to corrosion and seizing than a new thread.

How much does the vendor want for it? with a damaged thread it should be close to free?😅

4 hours ago, Chris Ross said:

Very fine treads like that are a problem they can be difficult to start even when not damaged. Yes the aluminium is soft but if you are also screwing a soft aluminium adapter in to try and fix not much happens and there is a risk of cross threading and doing more damage.

The correct way to try to fix this is using a thread file with the correct pitch of 0.75mm. You carefully place the teeth in an undamaged section and carefully move it around the circumference. It is meant to lift and straighten the teeth of the thread. It may be difficult to do with the glass in place though.

The down side of fixing is you scrape off any anodising and it might be more prone to corrosion and seizing than a new thread.

How much does the vendor want for it? with a damaged thread it should be close to free?😅

Thanks, I think I'll stay away.
He's asking for roughly $150 USD, which is a bit much given the issue....

Had a similar issue with an old Nauticam Port which 67mm thread was completely damaged, it couldn't screw and hold anything like a macro wetlens.

I used a neutral filter mount I had removed the glass before, and glued it to the damaged thead.

It worked for a year and 2 dive trips, I anyway had to buy another (new) port since I changed my whole rig as well.