Originally Posted by
HillRider
That plastic tool is intended to limit the torque you apply. The specified torque is 0.7 to 1.5 Nm which is quite low and well within "finger tight" using that plastic tool. BTW, that tool is really cheap so it's not like you are being taken.
A standard 8 or 10mm allen key would allow (or encourage) excessive tightening.
Exactly this. The OP is obviously not a mechanic nor has he paid any attention to the Shimano service instructions.