THE ELECTRON SCALE IS: 10^-33 CM, however the electron string can rotate intern by hinges into other particles.

Invention of  new particles (Duda-Vuyk) needed to build and transform a primordial Axion string.

The electron string (-Axion) rotate intern by restricted hinges over 90 degrees, into all other singular particles

Q-FFF Theory: see: 3-Dimensional Rigid Transformer Strings with Composite Topological Strings

https://vixra.org/pdf/2002.0074v1.pdf

and: https://vixra.org/author/leo_vuyk

Below: How strings are able to merge at close distance.

The vacuum pressure ( Casimir) seems even the origin of black hole nucleus forming compacted by the vacuum pressure !! 

In Q-FFF Theory the reducing vacuum pressure on the Big Crunch Black Hole, is reason to propose a cyclic universe.