I was still really green - Started new in Jan of that year and we were there when Hurricane Hugo hit NC which was in Sept of that same year so some of this may be confused. What I recall was 6" wasn't even a standard electrical conduit size and it all had to be special ordered. We had a hog head extension and a bar that looked like the drive shaft of a car that attached it to the regular threader. We being redneck electric had of course jumped the foot control across so it wasn't needed and one of the guys got his arm caught and almost ripped off before someone heard him calling to unplug the thing. This was also for aircraft that use 400 hz (cycle) power that had all kinds of special equipment as well. If I knew wtf I was doing it would have been way cooler.