Why no love for this GE roundie ?

[Electronic M]

It is important to have a good H osc. tube, but I don't think that is the MAIN problem with horizontal hold.

What I hope you have or are willing to get is the sam's and a diddle stick (a small PLASTIC* hex key). *If you use a metal one you are likely to crack the slug, and it is harder to adjust since the metal acts like part of the slug, and once you pull it out your adjustment will be off.

You need to adjust the horizontal osc slug to dial in the hold...You see the front H hold pot on most sets is a fine hold control, the coarse hold being the slug(s) adjustment. Don't just randomly adjust it, follow the sam's procedure since there is the potential of damaging the fly if it is badly out of adjustment.