close/fill holes in mesh (TIN)

in Vector Data
Dear community,
i searched the knowledgebase and the forum, but even though it's a basic process i didn't find a an answer. So maybe you could help.
After creating a 3D model (mesh) from a subsampled point cloud there might be spikes and vertical fragments left, that i want to cut out manually. Afterwards i want to re-mesh the resulting hole.
The "Close gaps between adjecent features" tool sounds like a good choice, but gives "overmeshed" results - depending on the entered distance.
Can you recommend better settings, or another tool to use in GM?
Thanks a lot
Alex
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