Need a spanner wrench to open Summarit for cleaning

[Steve Ruddy]

I want to open a Summarit 50mm f2 lens for internal cleaning of the lens elements. I need to purchase an adjustable spanner wrench and am curious which ones you all like.
Here is my lens. It's producing soft images. I hope it will clean up, because I just had the body serviced and the only other lens I have is the 35mm Elmar, which is in the same condition.

 

[JeffS7444]

The best spanner is sometimes no spanner:
https://www.bhphotovideo.com/c/prod...hobby_tool_jht9520_vacuum_pad_for_camera.html

 

[Phil_F_NM]

That's just Leica "glow". You could use a drain stopper if you really need to take it apart. Until I got my set of spanners, I always used non-knurled jeweler's pliers. Sometimes I still have to.
Phil Forrest

 

[aizan]

Here are some spanners that are currently available.

https://www.ebay.com/itm/Adjustable...434991?hash=item3b434179ef:g:WoEAAOSwEK9T7F9g

https://www.ebay.com/itm/Camera-Len...709094?hash=item3fda146426:g:yh4AAOxyThVTZWUs

https://www.ebay.com/itm/Pro-Spanne...016300?hash=item3d7af70dac:g:0MIAAOSwKSlb9-lE

I have the latter two, as well as SK Grimes, and to start out I would recommend the last one pictured above. It locks down tight with a hex wrench, and you can grind down the replaceable tips with a Dremel tool.