Mick, assume your '750 is earlier than the K1 / K2 as these bikes did not have individual springs within each carb...according to the parts diagram. (Parts 8 & 12 first two diagrams)
The job of closing the carb sliders is done by only one biggish central spring. (#14, third & last diagrams)
The K1 / K2 carb set-ups are shown in the last diagram.
Apologies if you know all this... but it may help others with what you're specifically after.
Simon