<VV> home distributor rebuild?

[Ramon Rodriguez III]

I have the tech guide and have read through the entire ignition section.
 This gives me lots of data on identifying correct parts for my 140/4 etc.
which is very useful.

My 140 distributor has just a tiny bit of slop in the shaft... it might be
tiny enough that it's not even worth mentioning, but I'm being paranoid at
this point.

More noteworthy is that there is a little rotational slop in the gear to
the shaft itself, again not much but I know it should definitely not be
this way.

I have two other distributors on hand, one original standard Corvair unit
(I forget which specifically), and one replacement non-original.  The
non-original is super tight but I know the total mechanical advance is
totally wrong (from the tech guide) for my 140 unless I modify it
appropriately.

I want to build a good distributor using the correct 140 parts.  Can anyone
direct me to a nice step by step guide for rebuilding the distributor at
home?  I've never had one apart before so I need lots of details etc.

Thanks,

Ray R.