If it’s tight it’s not enough.
I have the same tool but I don’t have a base that can hold the case nicely and safer than my hand and I had problems opening a caseback.
My advice would be that tool in conjunction with something that can hold the case for best results.
Yes, a case holder (with nylon pins) is very helpful. Put the watch in it, and then mount it in your bench vise. That way you can use both hands to keep the tool engaged. They really aren't too expensive and they come in pretty handy.
Someday perhaps I will invest in one of those $1000 sets with a press and lots of different dies from Bergeon or Horotec.
That Press is overkill, unless you need to open rolex case.
