SU-27 Throttle Functions

[LOGICNC.COM]

Anybody know what the lever on the back of each throttle half is for in real life? The levers on the front side are for the gate stops, but I haven't seen anything which explains the function of the rear ones?

 

[Spectre11]

At least in some western aircraft these detents are used to move the throttles from shut to idle and the other way round. This prevents errorneous engine shut down when the throttles are slammed down from higher throttle settings. Dunno whether it's the same function on Russian A/C, but I suppose it is something like this.

[wasserfall]

Those are for independent movement of the left and right throttle.