QUOTE(Jim Stevens @ Apr 23 2009, 07:01 AM)

I think it is very, very wrong to attempt something like this. As I have posted elsewhere, the flute, as it is, is a whole system. That is, the intention of the flute-maker was to make a 5 hole, or a 6 hole flute. And there would be a logic, and a "scientific" basis to the way that flute was made. There is also a different charm to a 5 hole than there is to a 6 hole, to the nature of the fingering. And as I also stated elsewhere, if you want a six-hole, buy a six-hole.
Hmmmm...
For me, there is nothing difficult in turning a five hole into a six hole.
I've done this many times.
These flutes are basically the same.
If the maker have done the layout on a classic six holes one,
but omitting the 4th, like most makers do,
it's very easy to add the extra hole.
A bit of tuning on the two top holes after that, and it's OK.
Sure, I would not recommend this to every flute owner,
but as soon as someone ask, I assume he knows what he wants.