Strong vibrators

I love using large (>3.5inch diameter) butt plugs, and I love vibrating butt plugs, but I haven’t found many large vibrating butt plugs.

So I was thinking about making my own by putting a strong vibrator inside a hollow plug. I really want something strong that’ll shake up my insides real good, I adore that feeling. Does anyone have recommendations for powerful vibrators or alternatives?

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