Sorry for answer by question but I think the question is not so expressed to know what exactly you want to edit.
Is this bar hook length or default database value?
I supopse you need to change this.---------------------------------------------
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4D rule is saved there.
What exact change you want to make in database?
OK
What value it shows under the red crosses on your picture?
Change in bar_SNIP 2.03.01-84.xml database positions HookLen180="3" onto HookLen180="4".
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