The knotted dildo problem

So, I have a knotted dildo that (obviously) I can’t keep on once it’s “popped off”. The knot itself on the dildo is 6.6cm wide, and the usable length is 17.8cm. And I’m not using a lot of lube already, only enough to fit 4 fingers in, so “less lube” is not the answer. Any help or ideas that could help me would be greatly appreciated!

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