I recently got an SP 15 and the motor was noisy when running so I checked and no lubricant and added some, less noisy but still makes noise. Seemed like the angle of armiture the motor sits on affects sound so I fiddled with tightening and loosening the bolts on side of carriage to change height and position of ink drum with some results. (Not sure if that’s what they’re for.) Now when I run motor the ink drum makes contact with my back roller even when the ink roller assembly is in the up position. Is this right? It doesn’t seem like the roller should sit on the drum. I do have the rollers adjusted correctly for inking. Any help with how to adjust the ink drum and the noise I’m hearing would be infinitely appreciated, I don’t want to damage anything.