The first two pictures are of the fan I added to exhaust hot air from the top of the HV cage. The 12VDC fan is powered from the 6.3V filaments through a voltage doubler rectifier. I put the fan where it would exhaust the hot air generated by the HV regulator tube. There is a slot in the plastic plate that the fan mounts to. The slot is where the air enters. I epoxied a smaller piece of plastic to direct the cool intake air to the flyback first. So the flyback gets the cool intake air, then it goes by the HV rectifier, then the regulator heats it, the hot air rises and the exhaust fan pulls it out the top. I watched a 2 hour movie on the set last night and then felt the flyback right afterwards. The flyback was barely warm.
The last two pictures are of a ring of plastic with Velcro to hold the convergence pole pieces in alignment over the guns and to keep them from flopping over. The springs keep the pole pieces against the CRT neck but also made them want to flop over. Not the greatest solution, but it works ok.
Dave