Fisher Filament Problems

I've had problems with the filament not extruding on the Fisher 3D printer. Usually it is when starting a print, the extruder motor skips and no filament comes out. Manually turning the filament drive doesn't help much, I have to retract manually and extrude repeatedly and then it's start up.
Anyway I had a bad episode this morning so I dismantled the hot end and screwed the nozzle in further and tried to get the PTFE tube aligned closer to the nozzle. We'll have to see how that goes, but it worked OK after I reassembled the effector.