I used a vacuum hose that I turned on and off quickly and it pulled the dome out very nicely on my old Von Schweikert VR4 Gen3.
The smaller dustcaps and soft domes look like push buttons, especially to small children. Even my 60-year-old sister thought a soft dome tweeter was a push button and I had to stop her before she jammed it with her finger. Just my take....Spooker