Perfect is a strong word, especially when it comes to converging such an old crt. But I feel I have got it as close to perfect as it can get. I used a crosshatch pattern from a dvd player that has rf out.
The right side was a pain in my ass because they used allen keys instead of knobs and they were pretty frozen in place. I thought I cracked one (for r/g vertical) but it was just that it was coming unstuck. Easy to crack the recessed allen key ones, I've done it before. Then you either need to find a new convergence board assembly or find a new coil
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DRH, the flywheel tuner on the UHF has a great feel to it. Not that I have much use for UHF... But it is nice.
On a related note, do all these 4 tube hybrids use a 20LF6 in the horizontal? I just looked up prices for some of these tubes and they are getting way high !!