Fitting lock on grips

I have just got new lizard skins charger lock on grips. The rings that go on the ends of each grip won't go on the end of the grips. Any advice of methods/tools to get them on?
Thank you for your help
Thank you for your help
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Trek liquid 10
Dolan Hercules Carbon
Either a little bit of soapy water or a gentle tap with a rubber mallet.
Carbon 456
456 lefty
Pompino
White Inbred
B'Twin Triban 5
Trek liquid 10
Dolan Hercules Carbon