Strut graft revision?

When a columella strut needs to be shortened and trimmed. During an open rhinoplasty is the top part left there with the scar tissue and only the bottom is cut and what is the process like. Another question... regardless of Either approach... the strut is in a capsule and when you trim it wont there be a gap of tissue??? Does this ever close up i am just very concerned as it happened to me?

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