Calm down, Bob! I didn't intend to suggest anyone was wrong! I was just offering a different point of view!

Any instrument that has been abused - either by being played too hard (particularly outside for Morris!), or by an inexperienced tuner, won't respond well to being tuned; metal fatigue will be a real problem.

However, in my experience - over thirty years - pretty well every high pitch concertina has been lovingly looked after, and will respond well to retuning.

Fortunately, older concertinas have reeds fastened to the reedplates with screws, so it is fairly easy to re-grind larger reeds to 'repair' smaller ones - I often use the 'surviving' reed on an accordion or melodeon reedplate for this purpose.

BTW, I have an original Lachenal portable tuning bellows, which lives in the case containing my Edeophone and 30 key Anglo, just in case an emergency arises!!