the best thing is if you get a torqe key that the outside of the star is just bigger the the rounded hole,get a hammer,tap the star into the hole,then just unscrew,it will come out first time
I had to drill my engine mount screws out to refit the exchanged engine that Nosram sent me - and I haven't even run my Hyper 7 yet! - just goes to show how good Tamiya threadlock is.