Ian out of curiosity what is your opinion of the Norris version adjuster Veritas/Lee Valley use in their planes?......
In a word, Pete, 'low'. I've got two Veritas low-angle jobs and my only real beef is with their adjusters. Both mine are last-century & have the original coarser thread adjusters. These are a bear for fine adjustments, the blade goes from zero to 100 at the merest touch! There must've been a lot of whining about this because a few years ago they came out with an 'improved' version with finer threads. They are very reasonably priced but getting it posted to our remote part of the world is prohibitively expensive so I've dithered about trying one. The Veritas suffers from the same blade-slewing problem as the original, in fact, I think they are marginally worse because of the short shaft. Both my Veritas planes are "set & forget" types so the adjusters don't bug me as much as they would if they were used like I use my Bailey planes on which I often vary the set several times a session.
There was a time in my life when I thought a plane without a screw adjuster was a very inferior thing, but nowadays, I'm just as happy adjusting by the tippy-tap method for planes that are usually set once after sharpening & not altered until the next sharpen. But I can understand how someone in their early woodworking career, or anyone who has just never been exposed to "adjusterless" planes would much prefer a screw adjuster.
Quite a while ago I was asked to review the Veritas small plane kit. I made it up "according to directions", and it was ok, but I did complain about the coarse adjuster in my write-up! This is the plane I made, which followed the design suggested in the instructions (thankyou Mr, Krenov):
I used an extremely dense wood, Allocasuarina leuhmanii, locally known as "bull oak" and the plane turned out rather clunky & just not nice to use, so a couple of years ago, I pensioned it of & cannabalised the blade & adjuster for a small infill (& made a chipbreaker for it as well, to improve performance):
That was a much nicer little thing to use.
Encouraged by that I had yet another go, this time I only used a Veritas blade (a PM-V11 in this case), and had a crack at making my own adjuster. The original Veritas has a right hand thread for the main shaft & a left-hand thread for the traveller that engages the blade. As you screw the main shaft in, the traveller "unscrews" & moves away, so the two threads are "additive" (The Norris is the same, but the LH thread part screws into the main shaft instead of being an extension of it).
My cunning plan was to make both threads RH, so that as the shaft is screwed in to increase the set, the traveller screws back. But because the main thread is much coarser, the net movement of the traveller is still "down".
Well, long story short, it worked. My plane has very fine adjustment (but it still suffers from the slewing effect). However, the cost is the threaded parts of the shaft had to be much longer than the Veritas version in order to get enough travel of the mechanism to use up the blade as it wears down. I couldn't fit it into a bun type rear end, so I made a handled plane:
By sheer serendipity, this turned out to be one of the nicest plane I've ever made. It has a sweet action & the PM-V11 blade handles our horribe hard woods with great aplomb. The adjuster is not as easy to use as a Bailey adjuster, and the plane is actually a bit ugly in the flesh (looks sort of disproportionate because of the narrow blade), but it's so nice to use, it stays with me to the end!
Sorry for the long-winded reply, but I felt obliged to give some reasons for my opinions....
Ian