How do you remove light armor blocks in tutorial 8?

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How do you remove accidentally placed blocks in tutorial 8: Your First Ship? I can delete blocks with the grinder on my ship but if I accidentally place larger blocks next to my ship it doesn't let you delete them? Why is this?
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Space Engineers Xbox: Tutorial 85 - Armour Panels and Blocks
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Images: Ksenia Chernaya, Ketut Subiyanto, Max Vakhtbovych, Ksenia Chernaya