What about adjusting the metal contacts by gently prying them with a small screw driver to increase the tension ?
Gerold - Nikonian in East FrisiaEala Freya Fresena
Copyright © Nikonians 2000, 2014
All Rights Reserved
Nikonians®, NikoScope® and NikoniansAcademy™ are trademarks owned by Nikonians.org.
Nikon®, Nikonos® and Nikkor® are registered trademarks of Nikon Corporation.