THE SHU RULE NOT ALLOWING 2 RUBBERS IN THE ONE THIMBLE, SO WHY CAN U TIME 2 BIRDS WITH ETS, SHU WILL HAVE TO CHANGE THE RULE, WHAT U MUST UNDERSTAND THAT THERE IS A LOT OF RULES IN THE CONVENTIONAL CLOCK RULES WHICH DO NOT COME INTO LINE WITH ETS, IE ALL BIRDS MUST BE MARKED WITH A RUBBER BAND, THIS IS WHY THEY BROUGHT IN SEPARATE RULES FOR ETS, CONVENTIONAL CLOCK RULES DO NOT APPLY TO ETS, AND VICE VERSA.