Vacula tip removal.

[Propaganda]

I bought this kit:
https://www.ebay.com/itm/Vacula-72-020-8051-7-Piece-Professional-Blow-Gun-Kit/141308672674
I just got it and put on one of the rubber tips and I can't seem to remove it. Anyone use this tool before that might have some tips?

 

[Bobioz1]

Hit the barbells for a couple weeks. They just pull straight off.