Sometimes yah just can’t win … many cameras utilized specalized manufacturing techniques to get everything together. When servicing these camera’s, you really should have the tools that were designed to work on these things.
One of them is a flexiclamp/ring wrench, the tool to remove the various retaining rings used on cameras without scratching them.
Some are very specific to a camera … which I just found out about the Canonet QL17 G-III. I encountered difficulty getting into the shutter mechanism because the front lens group put up a fight. Most other cameras of this type that I have worked on just required a spanner wrench or a rubber friction thingy … not this camera.
This tool is used to work on the front lens group (as noted in the service manual).
I can see why this is needed … the group is screwed on very tightly so friction doesn’t work. A spanner wrench is too wide to fit in the tight space. Even using my super strong stainless steel tweezers didn’t work, even though I could force it wide enough to connect to the slots, I could not get enough grip to prevent it from slipping.