1. I still think that ought to be an almost negligable issue, if being healthy, but as I said before it probably has not been
investigated scientifically since occupational "precision work" often is some kind of bench work (angle ca 90 degrees)
but precision work while standing certainly exists. Try to find out...
We may however compare ourselves with guitarists who nowadays quite often play standing and a very low position
seems to be preferred.... If good for them, why not for "us"..?
2-3. Roughly the same idea then...let's hear what Robin says if reporting back....
4. The point with the 20000/2000/600 grams example is that continuous static work with less effort than 8-10% of max
in most situations is considered being both feasible and not harmful. The average load from a fairly small concertina
thus ought to be regarded as practicable but of course there are several more factors involved, this being one
5. "one who wishes to avoid what should be the unnecessary constraint of adding shoulder straps".
What "constraint" ?? What "unnecessary"?? IF there is a *weight* issue - solve it ! And the shoulder strap is an ultimate
solution since it has the capacity eliminating the weigth "problem" entirely !
6. "Even someone who plays seated will feel the difference if they do not rest the instrument upon at least one leg.
Perhaps more so, since when playing while seated it isn't really possible to hold the instrument as low as 120 degrees
as the legs are in the way".
The pressure difference between 2kg or 1,4kg on the knees - is that really significant?? A discriminating factor when
choosing a concertina model? When seated resting the instrument on the legs the elbow angle will naturally be ca
90 degrees and that is the recommended situation for seated work in general so it can't be better.
7. "I agree that around the 1.4 - 2.0 kg range, weight is not significant to pumping the bellows".
For the *pumping* itself the weight/mass is hardly significant at all - for any common concertina playing. As I said before -
only if you wave the instrument around one way or other