Carriage bolt Tim post - too thick iron

[prototypen]

Forced?

Protte

 

[Freee123]

One alternative could be:

 

[S_B_O]

Now I have finished four holes. I had a bit of luck with the first hole and perhaps got a bit overconfident for the next one. But for the last hole, I made a simple drilling guide that did the trick. Now I only have 20 holes left to refine the technique.