OK fellers !

Here is a question I'm sure somebody with an old head laying around can assure !!
What if a person was to move over a half inch from the original bolt holes and make a NEW SET OF HOLES in the same circle ...

There ain't nothing says you can't ...

So here we go :
1. Draw a circle on the surface where the original holes are now .
2. Scribe a "X" 3/8 inch right or left of the original holes.
3. Drill a new hole for a 12mm or 5/16" tap
4. Tap the hole (use plenty of oil) and go nice and slow.
5. Clean the hole with ??? starting fluid ???
6. Insert a stud coated with thread lock
7. Walk away for a day !

Now the question is .... (drum roll please ) : how deep can you drill the new hole/studs ?