I?m needing clarification. I?m working on the iS fuselage kit. On page 21iS/U-03, Figure 2, at the bottom left side of the diagram, it says ?CS4-4, Both Ends Flush FWD Side?. I?m not sure what this means. Does this only apply to the single hole that the arrow appears to be pointing to? And does the flush manufactured head go on the F-01204D-1 side just like the LP4-3 rivets do? I don?t understand where the CS4-4 rivet or rivets must go and why it can?t be a LP4-3. Thanks