Steering wheel grain restoration?

[402Bowtie]

I'm about to restore a couple steering wheels. I've already seen these two threads on restoring them:
http://www.67-72chevytrucks.com/vboa...d.php?t=233643
and
http://67-72chevytrucks.com/vboard/s...d.php?t=340417

I still have these questions:
1) Has anyone restored the grain that gets worn down over time? If so, how? I was thinking about using a small screwdriver-like point/pick and etching the squiglies into the wheel, but I have my doubts at how good that will look.

2) I have two 69-72 wheels. Both have the grain on the two extensions from the center of the wheel. However, one has the grain on the inside portion of the top half of the steering wheel (as shown in the picture) and one is completely smooth with no traces of the grain ever being there. Were the steering wheels all the same (besides color) from 69-72? Could the one without the grain be a repop?

3) Some of the cracks are very small and appear like they are not finished cracking. Would it probably be a good idea to drill out the end of the crack to ensure the crack does not continue?

Thanks for the help!