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focus is an easy adjustment.
if you cant get it sharp all across the focus pot may be bad.
these work similar to the dual focus system in large pc monitors but with one pot.
tweaking vertical size will fix the gaps.
the convergence may be a bit of fun and may never be perfect.
the edges are adjusted by tilting the yoke.
center is done with the neck rings.
if the crt was replaced in the past with a cheapie rebuild that would explain the focus and convergence issues.
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