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I have to admit, no I am not using a torque wrench.
It looks the spindle has bitten into the crank the wrong way and it's a bin job :/
I could try to file it a little and threadlok, but chance of success are low. I guess i've nothing to lose...
JWestland-
Since it's a non driveside crank arm, bin it and get another 170mm diamond one.
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40 nm is recommended for most square taper cranks. It is more than you would think. Buy a new crank and find someone with a torque wrench.
Edit after spotting photo upthread.
The damage to the inside of the taper is from your dodgy crank puller. I reckon that crank will stay on fine.
edscoble
TM
Are you using a torque wrench?
Threadlok and 50 nm might be worth a try.