The problem with the Veritas Custom Norris-type is caused by the blades being shorter above the chipbreaker screw. If they had used a longer blade, as per Bailey, then the Norris arm could be longer, and adjustment would be finer. Note that the Norris adjuster is the same for both Veritas BD and BU planes.......
I am not sure I understand your point Derek, or what 'problem' you are describing? The short shaft of the Veritas version is mostly determined by the amount of room available in the metal frogs or blade-beds. There is simply more room in a standard Norris. The ease of lateral adjustment is determined by the ratio of shaft length either side of the pivot point which is a little less on the Veritas. It is therefore a bit harder to move with pressure on the blade, but the bigger problem is that it takes less movement to alter the edge angle, making it less sensitive The slewing effect is the same when the adjuster is off-centre,. The biggest difference between Veritas 's version & the original is that Veritas version engages the blade itself via a spigot & not the chipbreaker screw head. (they had to do that, since there is no chipbreaker on a BU blade, for which Veritas originally made their adjuster).
Because the Veritas engages the blade itself, it has to have some way of compensating for blade wear (you don't have to worry about that when you use the chipbreaker screw because it remains in the same relative position as the blade wears).. That could be done by increasing the screw travel (not enough room!), or simply adding more holes in the blade above the first one, which is, of course what they chose..
The "direct drive" screw adjusters work best on the low-angle planes for which Veritas originally made theirs because the lower the blade angle, the further the blade has to travel linearly to make the same depth alteration. I think they would have been better off with a single thread adjuster like this:
The single fine thread on my adjuster is more sensitive than Veritas's two-thread version (the left + right threads on both Norris & Verits are additive which simulates a coarser thread). I don't have any lateral adjuster, but that is easily done with fingers when the blade is slightly loose (which it needs to be for depth adjustment, anyway). I was amused to see that Vic Tesolin, Veritas's travelling tool promoter, eschewed the lateral adjusters on the Veritas planes he was using & simply tapped his blades with a small hammer for lateral adjustment which is a bit of an indictment of the system!
I've delved into screw adjusters a lot over the last few years, starting when I was asked to review the Veritas small-plane kit. The coarse threads of their original adjuster made fine adjustment very awkward when the blade pitch is raised to 45 degrees!
I found it a bear of a thing to adjust for fine cuts & had a whinge about it in my review. It was not long after that they came out with the fine-thread replacement adjusters (nothing to do with my review, it had obviously been in the pipeline for some time).
Anyway, that led me into the whole rabbit warren of adjusters & what makes them tick, & I made several different versions in a fruitless search for the perfect adjuster. The 'subtractive thread' system gives ultimate sensitivity, but requires two longer threaded sections which isn't appropriate for for small planes. It would be ok if I could fit the second pitch screw inside the main shaft a la Norris, but I don't have a tap long enough to cut the 25mm or so of internal thread I would need in the main shaft, so I'll never know for sure.
Frankly, I'm quite happy with the tippy-tap method of adjusting depth on most of the planes I make because they tend to be more "set & forget" types. My two workhorses are a #5 1/2 & a #4 Stanley and because they are called on to do all sorts of jobs in a single session, being able to easily adjust the cut depth on the fly (and not have the lateral adjustment go awry!), is a boon....
Cheers,