Out of the blue my older ZW.. for some reason what I think "might" be the common post problem.. what happens is anywhere from 0 to 12 volts if you grab the handle and wiggle it all is fine ..But if you go anywhere from 13 to 20 volts and do the same the power flickers on and off .
There are new carbon rollers in it..
I'll open it after the holidays but I'm using the inside thumb knob and all is fine...
Anyone ever have anything like this and maybe found it was something else .. thanks daniel
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You can try to switch the common to another common post and see what happens.
Besides the common post being loose and having a bad connection, the A,B,C,D posts can also loosen up and cause a bad connection. The originals are riveted into place and after 60 + years they loosed up and / or fall off causing a bad connection.
There are repair posts made just for this reason. Part # T-159.
I just remembered I only move the hot wire to the other leg... Not the common so it can't be that... 
OK. I would then check the control arms that have the carbon rollers attached to them. Seeing you just had new rollers installed, there might not be the right pressure on the arm to make contact on the coil.
You may have to bend them slightly to make proper pressure.
With limit time left till the lobsters are done... 
I did open the cover .. did not notice anything obvious .. rollers still attached etc.. But thats a good start I'll use some paper in between and check for drag,, THANKS!...and Merry Christmas eve to you and yours.. daniel
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