StarTech is right. Run it in then run it out several times with blowing out the hole between attempts. It will go to its final depth but don't force it. Slow and easy.
That is what I did but it was going in too hard so a machine shop friend looked at it and he said the screw that was in the new spring I got is too big diameter for the hole so he let me borrow a 6.1 metric tap and it worked fine.
