So I have started taking my unit apart. IMO everyone should get some toothpicks and paper towel to clean in the side grooves of the slider bar at the bare minimum. Mine was FILTHY. I used 99% ispopropyl alcohol as the degreaser.
The channel is shaped like a half ball with a slot at the bottom. This is so the bearings and bearing guide/retainer have a place to go. Mine was loaded with swarf, cutting oil, dirt, grease etc and the paper towel came out black and sparkly each time. It started out as a rough, gritty, grinding motion when you moved the slider to a very nice and smooth slide. It will occasionally hang up a bit, I think due to missing ball bearings making a gap that causes others to hang up.
Yeah, not really cutting it in the small grooves.
Much better when wrapping a small bit around a toothpick. This is just one of several that all came out looking black.
I was quite impressed with its construction. The green plastic parts are end guides for the bearings as they travel along and go in behind the slot to travel to the other side. The red part is a wiper seal to keep junk out of the bearings and is held into place by 2 #1 Phillips screws. They are fairly soft so be gentle. The wiper appears to be a brass or copper base with plastic moulded around it when you would just expect a piece of solid rubber or plastic at most. I started by taking it off but it is not necessary at all. Just use a 3mm hex/allen key to remove the screws holding the feet onto one of the sides and then slide the slider off.
The back of the wiper. Also best to clean this off as there was a good amount of grunge on them.
Be careful of the bearings. This is a step you want to do slowly and carefully as the wire bearing retainers can flex if the balls get bound up and balls can pop out. If one does pop out you can just lightly press it back into place. Thankfully I only had 3 total pop out during removal and reassembly. No curse words from me

There was also quite a bit of swarf underneath this part. I applied a few small drops of oil to the bearings on each side with a needle applicator and the reassembled. It can be tricky sliding it back on, go slow and watch for binding balls as they can start to push each other out of the guides. You might have to go back and forth a bit to get stubborn ones in.
A few missing bearings from the factory causing big gaps. You can also see the wire bearing retainers also held in by the green pieces.
Now onto the upright unit. You will need a 2.5mm hex key to remove the knob, and a 4mm hex key to remove the screws that attach to the upright guide rods. You can just remove the screws from the top and slide the entire unit off the guide rods. Be careful when unscrewing the screw rod from the gimbal unit. There is a spring in there between the 2 pieces and parts can go flying once it unthreads enough.
Sproing
The bronze bushings in mine were cleaned, there was a bit of swarf in each of them. The upright rods were a bit dirty as well. The threaded rod and threaded bushing pieces were all clean. I am once again amazed going over the gimbal. The sharpening rod guide is a LM8UU bearing held in with a set screw, and where it pivots on the sides are more bearings.

Given the price of the unit and where it comes from you would normally be expecting a bushing, probably plastic, for the rod and nothing on the sides. Also, as mentioned, there is a hole in the bottom of the gimbal assembly and a threaded one in the rotating section as well. If you look in the parts bag there is actually a screw provided that you can use to prevent it from turning. This is handy when you are doing things like serrated knives and you want everything to remain straight while the unit slides.
The screws on the bottom threaded bushing are 2mm in size (mine were slightly loose), the ones holding the sides onto the gimbal are 3mm. The one attaching the parking hook is 2.5mm. You can convert it to/from "left handed" mode by removing the screw and moving the hook to the other side. When you assemble the sharpener with the parking hook at the back this changes which side the stone holder will sit on when parked so if it is the wrong side for you from the factory you can switch it. I am not really a fan of this parking hook, it requires the arm to be up very high and far to the side. I will probably use a bit of coat hanger wire to attach to it and make a higher hook so it sits more even. I don't have a K03 to steal a parking hook stop from
The bearings in the bottom of the upright unit. One both for side to side and one that the rod rests on. As mentioned in the quoted post, the plate on the bottom washer is misaligned. There is nothing holding it into place. There is no nub on the bottom of the rod, the other bearing sits too high to keep it into place. I don't see a way of keeping it aligned as currently designed but I am not sure if it really matters. Once again, great quality on something you would have expected to be an empty hole for the price.
And unfortunately that is how my unit will be staying for the night. It is well below freezing and all the sockets are in the shed. The lock nut on the rotating gimbal screw is quite stuck and I can't tighten it up with what I have on hand.
Hopefully the pictures are useful for people considering a unit or already have one and might be looking to improve it a bit.