Thanks all. Think I am so used to much slower machines - have used these rolls for years and I suppose I have not adjusted my speeds accordingly, and need to take it down a notch or ten.
It looks like the flexshaft grease, will open it up tomorrow. Mightily annoyed with myself. My arm is screaming from shoulder to fingertip so am going to mainline ibuprofen and hope I don't manage to cause anything to explode or do anything else exciting tomorrow!