[peter_scott]

You get a reasonable start by doing it by the book but there after you just need to do it iteratively with a a tiny tweak watching the effect each time. In my set I found the metal screen that partitions the video detector stage was very influential and a bit tricky because it is tied to the chassis by the clamping action of the brass tuning nut and the plastic coil former and the thread in my former was damaged and not really capable of clamping properly.

Peter