How to repair base structures that can not be reached?

On base repair… how can structures be repaired if not able to reach them. My one base is an apex with foundations continuing down the base a few blocks. Using a steel and star metal repair hammer I can not repair them. Also go for internal structures within walls at varing heights. They just seem not reparable unless I tear it all down and rebuild?

If cannot be reached with an elevator, then unlucky :grimacing:

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