Hello, For those interested, I found the problem causing the hammer clicking. The leather(?) on the hammer butt was hard - perhaps from the graphite used for lubrication on the repetition lever - and upon return it would cause a clicking sound. I presume the only correct solution is to replace the leather (please correct me if I'm wrong), but just as a quick solution I needled it a tiny bit with my voicing tool and then massaged it with my finger. Seems to have done the trick, for the time being at least. - John
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