Mine didn't have a hole for an Allen wrench either. I just nervously held one nut w/ a wrench while I loosened the lock-nut w/ another wrench.
It worked for me :)
You should turn it down! I think its something like 12, or 14 flats. When you bypass it makes it like the FDC is wide open. Need to turn that down or the fun will be short lived. ;)
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