It depends -- a lot -- on the printer! Some of the printheads were designed to be taken apart and repaired (the one in the KSR43 is one such -- the service manual gives the procedures). Others can be dismantled fully and put back togehter provided you keep seemingly identical parts (like armatures) in the right places. Some cane be partially dismantled and then reassemled. And others are almost impossible to get back together again -- and alas most are in that last category, The prolem is the print pins themselves. When you take the head apart, the pins are forced back through the guides by the return springs. It is thenvery, very, difficult to get all 9 (or whatever) pins in the guides, in the right serquence, not tangled up. So how was it done originally? I believe the pins were made too long (so they could be threaded through all the guides with no tension from the springs), the head was assembled, and the pins ground to length at the end. The Anadex I've worked on was certainly of the type where you don't want to dismantle the head!. -tony