K&F Tripod | Plastic part

For those who don't want to read:
The model is NOT PERFECT. It needs some work, but it works with difficulty.

I used PETG filament, didn't check the others.

 

Now in more detail:

This plastic part broke a long time ago, but I couldn't find a replacement for it. I don't even know what it's called. After buying a 3D printer, I started looking for a ready-made model, but couldn't find anything.

(yeap, I just taped it up)

This is practically my first experience with modeling for 3D printing. I made three versions of the model: regular, thin, and ultra-thin. 

• The regular one was too thick and didn't fit in the tripod. 
• The thin one (the current model) was also too big, but with some effort, you can control the height of the tripod.
• The ultra-thin one fit the tripod perfectly, but it didn't fix the height at all.

I don't know how to improve the current model yet. But it already allows me to partially repair the tripod.

I would appreciate any advice. I have only recently started 3D printing and may not be aware of some of the nuances.