<VV> differential questions

[John McMahon]

Hi,

I've got my differential apart due to a cracked throwout bearing, and I'm 
inspecting everything while I'm in there.  The internal splines on the 
pinion shaft are nice and square, and I'd like to keep them that way.  Bob 
Helt in his book says that you can drill a 1/8" hole "opposite the splines" 
to aid in lubrication.  Does this mean right through the splined portion? 
Or next to it?  Or what?  All the way through, or just on one side?

Also, my yokes move in and out a little, as Bob Helt mentions they might. 
Obviously I can't do the check he recommends, where you pull on the wheels 
to see how far they move.  I can see that they move in and out about 1/16" 
on each side.  Too much?  Should they be shimmed, or the nuts replaced?

Thanks,

John McMahon
1965 Monza coupe 110 with 4 speed