TM    9-2320-363-34-2 CAB  BODY  REPAIR  (CONT) Table  6.  Correctly  and  Incorrectly  Driven  Rivets TOP VIEW (A) (B) (C) (D) (E) (F) DRIVEN UNSTEADY DRIVEN SEPARATION CORRECTLY UNSTEADY TOOL EXCESSIVE EXCESSIVELY OF SHEETS RIVET SET SHANK  LENGTH BOTTOM  VIEW Imperfection Cause A.   None None B.   Cut   head Improperly  held  tools. A c t i o n None C.   Excessively   flat Excessive  driving,  too head,  resultant  head much  pressure  on cracks bucking  bar. D.   Sheet   separation Work  not  held  firmly together  and  rivet shank swelled. E.   Sloping   head a.  Bucking  bar  not held  firmly. b.   Bucking   bar permitted  to  slide and  bounce  over rivet. F. Buckled shank improper  rivet  length and  E,  above. Remedy None Hold  riveting  tools firmly  against  work. Improve riveting technique. Fasten  work  firmly together  to  prevent slipping. Hold  bucking  bar firmly  without  too much pressure. E,  above,  and  rivet  of proper  length. Replace rivet. Replace rivet. Replace rivet. Replace rivet. Replace rivet. 22-20