I did it and had no issues. But protect your ears, those machines are loud.
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No issues either. I used a foam 3m yellow earplug, and a sleeping ear mold earplug on top. Plus the muffs they provided.
Ask the place about and explain your ear issue, I just wear the 3m yellow earplug but still was really loud, you should have a second layer to be safe. I went to a place with a really old machine too, so they are loud.