Many more pictures which may help if you are working on the front fork of an early Vespa.  Most of this should apply to the Vespa VL1T -VL3T models which had identical forks.  I have rebuilt both the VL1T and the VL3T front fork versions and found the parts to be similar.  These are photos of all the components of the VL3T Vespa front fork during disassembly and reassembly.

First we can look at some images of the front hub and the lower channel in the fork  through which the front hub/axle pass.  These details show the roller bearings and the roller bearing cages.  18 roller bearing per side held in place by a little cap ring.  After you rebuild and  slip the axle back in to the fork be careful  not to knock any of the rollers loose.  That will mean starting all over.

This is where the speedo drive will insert.

here are some close up shots of the large bearing on the lower end of the front axle on the Vespa VL3T.  You can see there is a felt ring seated underneath the bearing.  When the whole thing slides back together this felt ring forms a seal against the hub which keeps dirt and moisture from getting in to the bearings and axle.  I had to use a bearing puller to remove this bearing.  We will talk about reassembly below.

The main hub axle also has a smaller bearing on the "far end"  this will remain in the hub when the axle is driven out.  IMPORTANT:  you must remove the speedo drive before you drive out the axle otherwise you will destroy the speedo drive and possibly damage the axle.  Once the axle is driven out  in the direction of the large bearing the small bearing can be driven out the other side using a long drift.  I was able to use a socket on a socket extension quite effectively. There is a spacer which sits on top of the small end bearing and allows for the cap to be tightened properly.  Below you can see pictures of the spacer and the fully drifted out bearing seat.







These pictures show the spring pivot and the brake shoe pivot for the Vespa VL3T front fork and front hub assembly.  With some of the unique bushings and washers that are part of this assembly.  You can see all of these parts in the parts manual found here on scooterhelp.com.  I started to get lazy with my photos at this point.



Finally I have some photos of the whole thing put back together with new bearings in place.  I just need a new shock and brake pads for this front fork assembly and the VL3T front end is ready to ride. 
Note the p.s. below.  Brake pads must be installed before the axle!








One thing to note when driving the main axle back in to place.  I guess there are several methods but this is how I tackled the job.  I placed both the large and the small bearings in to the hub first.  Then I greased up the axle and froze it to reduce the diameter size.  I know some people complain about condensation in this process but it has never caused me an issue.  Once the axle was good and cold I carefully drove it in to the large bearing.  Once it gets started you can then flip to the other side and attach a nut to the end of the axle and "pull" the axle in to place using the small end bearing for leverage.  Now the way this whole thing works if you use just the nut on the end of the axle and pull you would be using the inner race of the small bearing for leverage.  I did not really like that idea.  I am not a real fan of putting pressure on a bearing if not necessary.  So I found a proper sized washer that would allow me to spread the pressue over the entire body of the small bearing all the way to the outer race which in turn is supported by the hub.  This will all make sense if you are doing this in your shop.  I should have taken a  picture. 

Once the axle is pulled (or driven) all the way in to place the securing nut goes on the small end and you fit the cover. Good luck.

p.s.  rookie mistake.  You must fit the brake pads first before you fit the axle.  Otherwise it is impossible to fit the brake pads and the spring.  A quick look at the pictures below will show the problem.

So unless you like doing things twice (like I have just done)  Brakes pads first, then the axle.