The rim looks like this.
It's paintless, does not change the rim's weight, and isn't trying to be 100% perfect, but it's a real surface.
Complete after-sales service through simple procedures, which is what we have been pursuing.

^Nice,
I'm sort of new to building bikes...

Can you explain how does adding an extra spacer will resolve the headset play? Also where did you purchase the spacer from?


On my end, i did the same as TinyDinosaur and it seems to have worked for 1 ride. Will continue on a few other rides and report back.


Thanks

Just a regular round spacer/washer/ring, whatever you want to call it (see picture).
As I said, i think that 0.5 would be enough, and searching for thinner spacers I found this from FSA https://www.tradeinn.com/bikeinn/en/fsa-spacers-kit/138244357/p
look at the description:
 "Integrated headsets sometimes require micro-spacers to adjust the depth of the machined headtube in order to ensure correct fit. Micro-spacers should be used between the top cover and compression ring to make sure the top cover does not contact the top of the headtube."
That's exactly what I did, so, from this description, I assume that this is not a problem of this particular Hygge's frames, it's a common issue. Also I just realized that is enough to install the ring as it comes, not necessary to cut it into a C shape. I'll try some day which thickness is the perfect one, for now I'll stay with the 1mm as it works.
 

...... a) I asked and was told they were post mount and b) the calipers are using an 70mm spacing that looks like post mount but uses M5 bolts like flat mount. ......

......

So, now I’m wondering what calipers might be compatible with the LTWOO levers. ......

What I want to say is that Ltwoo does not adhere to any known standards, whether it's flat mount or post mount. Ltwoo has designed its own specification and provides a bracket with the kit to install it on most flat mount frames. Therefore, you will find that the included screws are M5 size, not M6. Additionally, this Ltwoo-specific specification was not initially designed to accommodate post mount frames, meaning it cannot be installed on any post mount frame.

As for the second question, it is actually easily solvable. Any Shimano hydraulic disc brake caliper compatible with mineral oil systems can be used with Ltwoo's control lever, including but not limited to models like MT200, M6100, R7170, GRX400, and so on.

You just need to ensure that the syringe, olive head, and hose are compatible. I recommend using BH90 components across the board because BH90 hoses can be directly installed on all BH59 compatible components. As long as you ensure proper hose installation, you don't have to worry about any compatibility issues.

I have paired my GR9 control lever with the UR300 flat mount caliper using BH90 hose, syringe, and olive head, and the braking performance and feel are excellent. I have been using it smoothly for nearly 5,000km without any issues of brake fluid leakage or loss of braking power. So, feel free to boldly pair them together.

Yes they do include a generous collection of hardware. Unfortunately a) I asked and was told they were post mount and b) the calipers are using an 70mm spacing that looks like post mount but uses M5 bolts like flat mount. Something I read tonight suggested that this is one flat mount standard (the ones on my road bike are much narrower at 30something mm) The included adapters are also 70mm rather than the post mount standard 74mm (seriously, who in the industry decided to invent a new flat standard 4mm different and using one size different bolts? ) I thought about drilling it out but there isn’t enough material in the right places. I also do not find anyone doing flat to post adapters for the 70mm flat variant.

And while you’re right about drop bar bikes being more likely to use flat mount, this is a gravel group set where post mount is not rare.

So, now I’m wondering what calipers might be compatible with the LTWOO levers. I know that early on they were bundling with other makers calipers, so I’m guessing the piston ratios are probably common. Maybe Shimano compatible since they went with mineral oil. If so, that would be great since apparently pretty much all Shimano calipers are compatible including across road and mountain groups.

Not sure about Ltwoo's electronic groupsets but I am running a GRX400 front caliper with my Ltwoo GRT groupset since the mounting brackets for their caliper were not compatible with my fork.