The Exterior Backup for V-Grooves controls where the Blade Plunges into the Matboard (not the Fallout) on the Exterior Cuts of the Outside Cut of the V-Groove. The Exterior Cut is where the Blade Plunges/Retracts from the Matboard (not the Fallout). If the Exterior Backup on the Outside Cut of the V-Groove is cut Too Long, Decrease the Exterior Backup. If the Exterior Backup on the Outside Cut of the V-Groove is cut Too Short, Increase the Exterior Backup.
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