dismantling procedure for tachogenerator 2

[panter]

Hello , everyone !
I have a request to change the bearings and treatment of collector on 30 year old Hubler tacho-generator with permanent magnet.I do not have dismantling instruction . I'm afraid unable to stop interruption of magnetic circuit and my colleagues say 25 percent lower output voltage of the generator after installation .I was wondering if anyone has similar experiences and a certain way to not spoil functionality of the magnetic circuit .
Thanks in advance .

 

[Compositepro]

The magnetizer I built and demonstrated in 5th grade show and tell used a strip of aluminum foil between two nails for the fuse and 120 volts. I think it was a project out of Scientific American's Amateur Scientist column. It worked well. The problem is you can't predict which end will be north. Discharging a capacitor is the more common method.

 

[panter]

finally I got some parts of a old Hubner catalog and it shows how should look magnet keeper . Bearing in mind that my tacho has 6 poles I will listen to your advice and I'll make a easier variant .
thank you all for your help

http://www.scribd.com/doc/193541058/Tahogenerator-TV