Deburred all outside holes and all edges on vert stab skin. (Inside holes done previously.) Cleco on to vert stab skeleton. Further radius removal needed on the VS-1202 spar and VS-1205 and 1206 ribs for proper fit. After cleco together again and did an inspection inside I noticed two small flange tabs on VS-1207 had bent and not engaged with the cleco. Put a 3/32 cleco in and it fit okay. Removed all clecos and inspected part. Hole was incorrect size so I drilled to #30. Refit the skin with clecos on both sides with good fit. Took longer than expected due to multiple times installing and removing clecos.