My original reason for joining this forum was to repair my dad's Jon. 70E. It had a bad SEM (ignition) unit that apparently fail often and are nearly impossible to find. I guess he was lucky that it last 20+ yrs. before it died. Links to my threads are here: http://arboristsite.com/showthread.php?t=33589 I'm sad to report that the used SEM unit that I installed also went bad several months later, so I'm back to searching for a NOS or used but working SEM. I'm curious to know how many running 70E's are still out there? I also wonder if there are any other lesser known parts sources out there that I may be able to mine? I already have a call into George Blake (motorsag). Thanks!