Question about using M10X1.5 thread chaser.....

[HuskyMan]

on the 1984 300DT, using M10X1.5 Lang tools thread chaser to clean up threads in the passenger side motor mount arm. I placed some Kroil oil on the chaser; the chaser goes easily about 1/2" into the threads. At that point, I need to use a wrench and it becomes harder to turn the thread chaser the further I go.

I backed it out because I don't want to ruin anything. I then carefully measured the actual M10X1.5 bolt in a new motor mount and it looks like I need to chase the threads another 1/2" or so.

Question; if I keep turning the chaser can it damage the threads? I read on the Lang website that if it gets difficult to turn the bolt a turn, then back out a turn then go back a little further, etc.