I did something similar, but take the post above's advice as he didnt make the mistakes I did.
I used a 1 1/4" conduit punch (~1.75" hole), which meant a bigger dimple. I also used a custom made tool but had it made to exactly 2". With the flex of the larger dimple this left me with a hole a fair bit too small. It took alot of grinding/hammering to get it in place.
If you can... start with a hole that is closer to 2" (but not too close), and use a tool that allows for you to go slightly larger then 2". It will save yourself alot of grief.
I used a 1 1/4" conduit punch (~1.75" hole), which meant a bigger dimple. I also used a custom made tool but had it made to exactly 2". With the flex of the larger dimple this left me with a hole a fair bit too small. It took alot of grinding/hammering to get it in place.
If you can... start with a hole that is closer to 2" (but not too close), and use a tool that allows for you to go slightly larger then 2". It will save yourself alot of grief.