I’ve been having a problem on and off for the last few months where the top carriage, when rollers are engaged there is a fast knocking noise emanating from what seems to be the large oscillating roller.
if i lift them ever so slightly or push them back it goes away but only temporarily.
I’ve checked the crescent and it looks like it’s in good shape and i flipped it to see if that was causing an issue, but it knocked with the crescent both ways.
I just installed new form rollers and the knocking was gone for a whole day! now it’s back.
Any ideas about what to adjust or why it’s happening?