I cannot fin the “Twist resistant hex insert” googling it
This is a term that McMaster-Carr uses. We are using a part is dimensionally very similar to this part.
I´ve found this insert so far from a distributor in mexico
I doubt that you will be able to find a 316 version of this part without getting a machine shop to make it for you. If you need new ones, we can send those to you. We may be the only place in the world to find this part in 316 stainless.
If i try to design my own base to tweak a little bit the design of the BR2 should it be possible to use this kind of inserts or i better try to use the ones on the BR2.
We have not experimented with that type of insert, so I could not tell you what results to expect. I would say generally the larger the threads on the outside of the insert the more likely it is to work well. The problem with these inserts is they pull straight out of the hole they are placed in, so the more surface area preventing that on the outside the better.
As i dont have a mechanical press im afraid i can break the HDPE frame.
You will not break the frame by using a hammer to press in the insert, unless you do something really creative. On the bottom panels we installed the inserts using a hammer, since they didn’t fit in our press. Worst case you will dent the frame near the insert hole. This is assuming you fully remove the part with the bad insert before reinstalling the insert.
Are this inserts the same im pointing out on this post?
Yes. The new design addresses the insert getting pulled out problem by putting material between the insert and the edge of the piece. The picture below shows this.