[Antipodal]

Hi everyone,I am seeking advice on sorting a problem with this radio. It has a permeabilty tuner, the ferrite cores of which are located by threaded brass rods in the "pushbar" which pushes the three cores in and out to tune the preset stations.Originally these three rods were located in the pushbar in some sort of hard rubber or plastic grommets,which had an internal thread in which the brass rods turned,  allowing for alignment of the r.f  mixer and oscillator cores at the factory. What has happened in my set is that the three rubber grommets have all disintegrated such that the cores  are now free to move around randomly. Not good!I have figured out a way to embed same thread brass nuts in RTV in the pushbar so that,once cured the cores will once again be " tunable". I have a signal generator,a signal tracer and a frequency meter but I am wondering what is the best and most straight forward way to get these cores back into synch. Any help and advice much appreciated. Thanks