My 2c, Grab-ons if you like but no, a sponge too far.

This is my fix for the problem.

A bit hard to see here, I wrap from the hoods up with cork, generic black foam then wrap the whole bar again with Cinelli or more black, makes the top thicker with more cushion.

The bigger around helps more too as its easier to hold on too and fatigues less.




And here's some Grab on goodness just for fun.