G'day Bernard,

If you read my posting carefully you'll see that I wrote " ... A small particle of solder can be effective ... but the distribution of mass ... will alter." I didn't say that it can't be retuned by careful filework.

However, I did say, later: "A lot of old concertinas go downhill with retuning" and I stick by this - particularly when they have already been tuned by others. There is only so much scope for taking away more metal before the reed is better served by renewing it.

Regards,

Bob Bolton