The back check leather has probably lost it's resiliency. Either recover with Ecsaine or replace them altogether. I had an old Bluthner which had the same checking problem. The suede was a bit stiff and I replaced it with Ecsaine. I was very surprised with the outcome, the action took on an almost luxurious feel. The checking problem disappeared. A softer check-in removed the impact of the check which is felt in the finger and it improved the tone - double surprise. Be careful with a deep dip, jack can start to break on those old wippens. Make sure the jack is not bound between the stop felt and let off button. -- Regards, Jon Page
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