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If you look at core planes, many have repairs visable in even in "new" planes,
probably ones that failed margin tests. I looks like the way cores in the
middle of the mat are replaced is by snipping a bit of the drive and sense
wires a couple of cores away from the faulty core, replacing the core and
threading in a bit of new wire for the drive and sense lines, with enough
slack to solder the splices above the plane. You can see the little splices in
many core planes (usually covered with a tiny drop of glytol or some such)
Peter Wallace
Another method I've seen is that the repairs are made only at the edge.
There would be a number of solder points at the edge of the frame
for this. If something got damaged in the center, it was unstrung to
the edge and new wire soldered on.
For some applications they were allowed only so many repairs per
plane.
The problem I see is if the plain has been coated, there is not an
easy way to repair them.
Dwight
