Bogie. Welcome to the forum.There are no experiments that I have seen, or heard of that have ever suggested that electrons have any type of internal structure. The decay of a tau, or muon, to electrons has always seemed to stop there. Along the way neutrinos are emitted, of the correct family type.
No scattering experiment involving electrons has ever suggested that there is an internal structure. They are point-like.
Even the decay of muons and taus is inappropriately viewed as being a "complex" electron. Those particles are not composites of electrons, muons, and neutrinos traveling in a troupe.....the disintegration is mediated by a weak force carrier. If the electron decayed to a smaller simpler particle, the charge would have to show up on it, or you would violate Conservation of Electric Charge....a Law that has never been seen to be broken in any cloud chamber, bubble chamber, wire chamber, or spark chamber anywhere. You will have to search the archived photos to find one, or program a UA1 detector to search for one, or look for one in DUMAND, or some such....Pete.

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A third rate theory forbids.
A second rate theory explains after the fact.
A first rate theory predicts.
A. Lomonosov