How to fix infinity on Russian Wide Lens Industar 69 M, per se, is not a secret.
But getting a right below elbow amputee do it is not an everyday experience. Being that person oneself, one cannot but go at it.
People will tell you left and right that you need their "new bionic hand" to do all kinds of things and they parade their "bionic" hands "holding a newspaper" because "it is the little things that count".
Who knows : )
Quite possibly, after a decade or so, looking back, you still are filled with awe just how well you held that newspaper back in the days. Or, how you posed with that hand back in the days, while asking someone else to change that bike tire for you. I do not want to exclude that possibility as remote as it seems.
But from where I am standing, it's still the big things that count. And the thing is that very small things are not what is meant with "the little things". Very small things can be so difficult to handle that it is a big achievement, despite the size proverb pun.
So, this basically means to use extremely small screwdrivers and handle tiny bits in a precise way.
Lens block and cover detached:
The detailed instructions are here:
And so it turns out that this is a great lens.
Great achieve : )