implementation of this idea is quite simple. All it takes to try it is
to remove the cork from the bocal and glue on a slightly conical (outside)
plastic tube, with the smallest end towards the bottom of the bocal. In
this tube there are 4 grooves, where rubber rings should be placed as
needed for the bocal to fit tight in the socket of the bassoon. With each
tube a set of rings in 5 sizes is supplied, to accomodate the various
dimensions of Fox, Püchner, Yamaha, Heckel etc. bassoons.
smallest ring first, in the lowest groove. Check the fit, it should not
be too difficult to push the bocal all the way down. If it feels too loose,
try the next sizes until you feel it's right. After this, apply the other
rings as needed. Most often the biggest rings are used at the top, the
rule-of-thumb being that the ring size should follow the conical shape
of the tube and socket.
is adviseable to grease the rings a bit before inserting the bocal in
the bassoon, in order not to stress them too much. They may break if the
fit is very tight and you force the bocal. Just run a finger across your
face where it is a little 'greasy' and apply this to the rings. Twist
and turn the bocal gently to its end position, also when removing the
bocal after playing. If you don't stress the rings too much, they will
last for years, so finding the right combination of rings for your bassoon
is not something you should do every week.
from experience, Fox owners may have to leave the bottom groove empty,
no ring, as the space is too small for any ring to fit. The hard plastic
makes the connection and seal instead, which is just as good.