How I drilled my stud

[macafee2]

I have been unable to remove a snapped stud on my exhaust.
item 1 here https://rimmerbros.com/Item--i-GRID001957

I found a Youtube clipe showing how to drill a stud that had snapped below the surface. Mine is above the surface but it gave me an idea on how to do it.
I got a connecting 10mm nut
https://www.toolstation.com/connecto...8aAmqzEALw_wcB

and a long length of 10mm stud and a single 10mm nut.
I put both nuts on the 10mm stud so the stud was flush with the surface on the connector nut, I locked the single nut against the connector nut.

I cut the stud flush with the single nut. I then put the unit into the chuck of my lathe, far enough back so the single nut was behind the jaws of the chuck and the connector nut held in the jaws.

I centre drilled the stud that was within the two nuts and then drilled the length of the stud with a 4 mm drill.

I repeated the above and made two more "units" but with a 6mm and a 7.5 mm hole.

The 2 nuts were unlocked and the drilled short length of stud removed.

Te connector nut was then put onto the snapped stud on my exhaut and the short length of stud with the 4 mm hole then screwed into the connector nut.

I now have a guide to drill through the centre of the snapped stud.
I put a centre drill in the 4mm hole to centre drill the snapped stud. I did this to try and make sure the next drill bit did not wonder even though it was in a guide. This was followed by the 4mm drill but it would not drill the stud.

I changed the 4mm guide for the 6mm guide and tried with a 6mm drill.
This worked and the 6mm guide was replaced by the 7.5mm guide and a 7.5mm drill used.
I removed the 7.5mm guide leaving only the connector nut attached to the snapped stud. An 8.5mm drill fitted nicely within the connector nut and so I started to drill. Alas not gently enough and snapped the already snapped stud much closer to the surface.

Without a guide I drilled 8, 9, 9.5 and 10mm. I am still unable to remove the snapped stud but now with a 10mm hole I am going to use a 10mm bolt and a brass nut.

The guides were magnificent.

macafee2