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#1
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The service manual may be helplul, e.g. the 1965 THRU 1973 SERVICE MANUAL Sect. 8-3 ELEVATOR - TROUBLE SHOOTING table pg. 8-3 has two suggestions to address "SLIGHT UNDULATION OF TAIL DURING FLIGHT".
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Paul T337C 
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#2
09-06-11, 08:48 PM
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I solved my boom bounce by adding a bit more torque to the elevator hinge bolts. I had to go beyond the recommended value. My IA didn't want the compression on the bearings but in the end the smooth stable flight characteristics were persuasive. Check for even the slightest play and eliminate it. If you can't find anything try a bit more torque on those hinge bolts a bit at a time.
Best of luck _travis
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