Alexander,
As I tried to explain in former threads, we do not know anything for certain about the fact that large touch holes were characteristic of the period between ca. 1470 and 1500. I also pointed out that doubtlessly a considerable loss of gas and pressure must have been the result.
It seems not to make sense but still it is a fact. On the other hand we may not exclude the possibility that excessive use may have led to burnt out touch holes.
Best,
Michael
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