I Make a late Baroque flute after Rottenburgh and Grenser. It has an adjustable register and cork so that it will work well with a variety of pitches and embouchures.

I have recently started to make a flute after Grenser in blackwood or boxwood, also with a register and screw cork. The sound is bigger, and the top notes seem easier to play in tune. I do not have an image of it at the moment. The price is the same as the Rottenburgh.