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(From: John Del (ohger1@aol.com).)
I am assuming your talking about a NAP yoke made by Panasonic/Quasar also used by them as well. The vibration comess from the metal shunt inside the yoke which is used for "self convergence". The shunts were held by a mastic material that breaks down into a powdery substance.
Remove the yoke from the tube and bore a small hole in the plastic on both halves (top and bottom). These holes will be at the 12 and 6 positions, as the 3 and 9 will have windings visible. Fill the holes with white glue and let the glue settle in, rotating the yoke as it does. The glue will soak into the powdery material and harden it. You will have to do this several times until the glue oozes out near the clamp. Give it a full day to dry. This is better than paying $60 to $80 for the yoke.