Sadsak Slinky after multi-year break?

Just curious, in your guys’ experience, does the penis ever return to pre-PE levels of plasticity? I’ve done quite a bit of PE over the years, and I could be wrong, but I think some of the toughening remains, even after not doing it for years. Tried a few reps of the slinky today and found that it seemed to be almost as resistant as it has been in the past. I think jelqing has played a vital role in getting me the gains I’ve had so far, but I haven’t seen any progress from jelqing in a long time, and I’m looking at the slinky as a possible way to break through that plateau.