I am about to get our IBM1627 (rebranded Calcomp 565) going but the pens in the case is quite dry. What is the best method to refurbish those? What is the best solvent to get the old ink out? What ink to refill with? https://drive.google.com/open?id=0B-rp4vyPPYu1ZjVRbnlyczV4czQ