I wish there was a dislike button. Who are you, and how much 1st hand experience with VB and other frames do you have?
Saying there is "no quality control whatsoever from velobuild" is simply false. I don't even want to argue, I just wish posts could be downvoted.

I don't think there is any.  I've seen numerous frames first hand from them over the past 3 years, including one I bought.  Half were absolute trash ... and looked like someone had been messing around with power tools when drunk.  Some were actually quite good.  But it's a lottery as to what you'll get.  Maybe the suppliers they use are now less stretched than they were, after the covid goldrush ended, but there's still no evidence that recent VB stuff has any QC whatsoever, as total trash is still getting shipped - stuff you can spot from metres away with just a glance.

Pre-covid, I think they were much better.  Now, I'd never recommend them to anyone.

Wendy did reply to me and tried to help we're she can. I really appreciate that. But she told me that there is only this hanger version. So I guess I have to go without the stabilizing screw and try to index it somehow. As I'm reading in other forum it is also like that to e.g. Basso frames.

It seems only recent shimano derailleurs have this "stabilizing screw". Don't worry front derailleurs work perfectly without this feature.

it's also written in the LTWOO instructions manual that comes with the group, from memory.

With this group my first reaction is always this forum than youtube and last resort the manual. Think I've got my priorities wrong ;-)

I wish there was a dislike button. Who are you, and how much 1st hand experience with VB and other frames do you have?
Saying there is "no quality control whatsoever from velobuild" is simply false. I don't even want to argue, I just wish posts could be downvoted.

I'm sorry that you feel butthurt. It would certainly help the conversation if you could bring yourself to argue your point. Have you audited their production to know they are doing any QC? Are you sure you aren't conflating quality with quality control? In general you don't necessarily need any of the later to produce a decent product...

I've bought two frames from them, one perfect as you can only wish for, the other had a fork steerer tube that was 2mm(!!!) out of round, oval oversized pressfit BB (so you can't press in anything because you can just pull it out without any force), threads of the brake interfaces filled with resin, a seat tube that was only reamed out to about 7cm depth, voids on any machined surface and flaking paint right out of the box (that it wasn't painted as agreed upon should be a given at this point),.
The issues of that second frame are so obvious and present through the whole manufacturing process that I can't imagine even a rudimentary QC process to miss ALL of them and not pull that frame at some point from the production line before it reaches a customer.

I've audited enough production places to know the theme. They aren't evil, notice the defects and send them to the customers anyway - they just don't have dedicated processes set up so a defective product can be detected and pulled from the line at a later stage without incuring penalities to the person reporting the defects.
QC is a significant "non-productive" share of the production cost. If you can cut that, you'll be able to offer the product for cheaper. If your production is set up well in general, so the defect rate is low, you might even come ahead in customer experience on average.

Looking great. Almost done in 1 day... impressive!

You could have used some dampner on the cables to avoid that rubbing sound. Not sure you are a weight weenie ahah Some ppl end up not putting it because of the 30g extra 

As regards indexation I don't think you'll have a major problem with it. Keep us updated and show us the final result on the road too eheh