I wanted to attempt to make my own high note bocal by drilling an additional vent hole. I have seen some articles mentioning bore size and placement so I decided to go for it. I bought a Fox CVX 3 specifically to destroy and some heat shrink tubing. The drill bit that I used is an Irwin #60, it is 1.02mm.
I drilled through the top of the bocal at both 20mm and 25mm from the tip. Then I set 2 pieces of heat shrink tubing to cover the holes.
This allows me to choose which vent to use and also how much of the vent to have uncovered. So far I have noticed that the vent closest to the reed helps with the notes above high F but the tenor register has an airy rasp to it. The vent farther from the reed helps with notes to high F with less distortion of tone.
With the shrink wrap tubing put in place, the bocal works like normal. So it can be used normally for a piece of music and a vent can be opened for the specific passage that requires it.
This week I had a few Leitzinger Contrabassoon Bocals on trial from Forrests Music. I had a Leitzinger NML2 bassoon bocal a few years ago when I played on a Fox 601, but I sold it since it didn’t pair so well on my Heckel 10k. What I so appreciated about that bocal was the easy high note response and clarity in the tone. That bassoon had some funny pitch issues (saggy middle E) that the Leitzinger fixed immediately.
I have been using a Heckel C2 that suits the instrument well, so trying new bocals is just out of curiosity. Forrests has a large selection of Leitzinger contra bocals so I got to try each type and plating option, I ended up really liking a F2 Gold plated and an F2 platinum. Now that I have had them at home for a few days I have a sense of what these are able to do.
I notice almost no difference in response, pitch, or tone from the Heckel and the high notes are just as solid. The one improvement I do notice is when I use a light reed and play loud sfz attacks sometimes the pitch can sag with the Heckel, and the Leitzinger is more stable. However I do not like the bend, it angles down much more than I would like which forces me to change the instrument position. And lastly the price point is high. This thing comes in at $2,300 which is much more than a new Heckel bocal, without a huge sound difference. I am impressed by the sound and quality of this bocal but it’s a little too much for me!