butler182 it vary from case to case. I have another 3 batman to convert I will let you know if it is all the same. I tried using a tweezers to reduce the size but I cannot seem to get it to work, so I just source new rep hands instead.
It vary from person to person on how they want to achieve the goal. There are many ways to skin the cat. And is very unlikely all cases are the same since it is a replica hands. I didn't have any issues installing the other hands for ARF. Only the GMT hand had issues.
You can try using a watch maker tool with a hole similar size to the GMT hands but unfortunately I don't have the tool to perform such task. I would not recommend to try to bend the case tube with tweezers unless you know exactly what you are doing.
KJ2020 is a very experienced modder here. You need to practice many years to have such skills. Otherwise you might end up with hands that is damaged beyond repair.