Thanks for the reply. I assumed that to be the case but when you learn from books only they are written assuming you have more knowledge than you might have. I have a 1929 manual for new workers pub. by General Electric that was given to new shop workers. Great stuff with pics .... do this ... don't do this. This is a broken tool.... don't use it.... here is a picture of the hospital you will go to when you screw up and do not follow correct procedures. Great stuff.