This is a knot fillin' job
(90# ELB)
Excavated, filled with sawdust/epoxy, then:-
Drilled for a plug, filed flat.
Drilled for a plug, filed flat.
Drilled for a plug, filed flat.
Drilled for a plug, filed flat, ok the last plug was a tad smaller than the other 3/8" ones
Don't reckon there's enough superglue in the UK to fill that bad boy, it was sooo deep I struck oil
The important thing about it is that there's good sound continuous sapwood over the area.
Del