Inon UFL 165 AD lens disassemble

Hi,
has anyone taken this lens apart?
I have 3 lenses, one with broken back lens, one with scratched front lens, and one with a minor dot on the front element that disappiers then on top or bottom.
These lenses are used by my girl friend, and she unlukily droped her first one, so the back element broke.
I found a used one with minimal scratched front element, could be used, but could not take it appart.
So i bought her a third one with a minor dot in the outer section of the front element, only had to rotate the sun shade..
Now she uses a different camera, and the M67 to AD adapter stops in a different angle, so the sun shade is 45 degrees of the normal position.
with the screws on the back side i can not get the right position, but maybe if i can take it apart and turn the front element....

Have taken down that plastic ring that covers the screws, sun shade is off, but can not open the front element.
It looks like it has 3 components, there is a ring with two spots for a tool on top, in the second i can see a tiny ellen key screw....

So if anybody has an idea how to open it, please let me know.

Regards,
Wolfgang

You need a lens spanner to engage the holes in the lens ring and some way to clamp the lens body and a steady hand.  You may find there is a seal behind the front element to keep an air gap dry behind that element and you would need to make sure that remains in place and is not damaged.  Be prepared that the threads could be seized.  here is a link to the tool needed.

https://www.ebay.com.au/b/Camera-Spanner-Wrenches/172514/bn_92056133

Alternatively if you have a camera repair place nearby (rare these days I know) they should have the needed tools and skills to disassemble the lens.

Thanks Chris,
yes the spanner is one thing, but i belive that the thread is stuck, because it is made of aluminium...
And if i have a close look, that is only the first ring.
In the second ring is a tiny ellenkey on one side, that could work as a lock for the next thread....
Will try that after the coming trip, gave her another Inon wide wet lens i have....

Thanks,
Wolfgang