Staedtler Marsmatic 700: Tehnical Drawing Pen Maintenance
Anyone had any luck reviving Staedtler Marsmatic 700 technical pens that were put away dirty and not used for a while. I just got my hands on a set of seven (retails for ~US$150) for $10, and have so far tried taking them apart completely and washing them in soapy water. So far I'm getting some gray, watery ink from the tight spaces I couldn't dry completely, but no or very little ink is flowing from the cartridge. Any ideas?