springloaded float-bowl needles

[tobisj@aud.alcatel.com (Shawn J. Tobin)]

Do these actually exist?  One of my manuals talks about 
spring-loaded inlet needles for the float-bowls on the SUs.
When my engine's roughly warming up it seems fuel sloshes out
the bowl vents in an unsafe-looking manner leaking onto the 
exhaust pipe.  According to the manual, these spring-loaded jobs
are supposed to cure this.  Anybody?

Shawn

PS I have Grose-jets currently.

PPS I will either buy a rebuilt dizzy from Autozone or rebuild
mine when I get around to it.(other thread)