Lie Nielsen

I recently purchased a Lie Nielsen Honing Guide. I really love the build quality, but I’m getting a poor result with my sharpening.
I’m hoping that by putting this out to the ‘hive mind’ of the internet, someone might be able to help me identify my problem.
I’ve checked the jaws of the tool close tightly, (they do) and they also close without any wayward flexing or offset.
When I clamp a chisel in the jaws, the chisel is perfectly square, as you can see in the photo.
However, after some sharpening, the honing is definitely not square.
Am I doing something wrong here?

I really want this to be my ‘go to’ system and I have two very decent diamond stones which I’m pleased with for the actual cutting. I just want to move away from freehand sharpening and I figured this would be a good guide. However, I’m wary about buying to extra set of jaws I need for some different chisels, before I can rectify this problem.
Hope someone out there can advise.
Thanks, Gary

Stanley 140 Rabbet & Block Plane

I’ve just finished cleaning up this Stanley 140 and tried it out. The 140 is a versatile plane which can be used as a normal block plane (with the removable side plate fixed on) and as a rabbet plane with the side plate taken off. The side plate is removed by loosening the screw at either end which releases it’s purchase on the pins on the plate.(These aren’t the original screws, they should have flat heads).
The design of the plane means the front portion has very little support once the side plate is off, however, and the planes benefit sometimes from being trued through ‘lapping’. In the worst cases, putting the plane through it’s paces in ‘rabbet-mode’ through tough grain, can lead to a fracture on the weak point.
The plane has a 20 degree skew iron which has a slight skew on it’s bevel, so it approaches tricky grain at a useful compound angle.
All in all, a very nice little plane showing some really original features and with a design that was so good, it’s been copied by Lie Nielsen, (like most of the Stanley planes) and improved with heavier grade materials.