To keep retired Pentel pens working you have to keep refills on hand. I have bought some that work great and others that do not. Many of these refills are at least 40 years old. The older SPC8s, SRM02s, SRM03s or the SRM04s refills seem to work good. The rollers in fine point do not but the MG8s do. Add all these refills to your collection.