What kind of bungy strap did you use to go through the foam?
May try one.
In Australia go to Bunnings, get the heavy duty 90cm anti recoil yellow strap. Also buy 1meter length of conduit to go through centre of noodle. You need to heat & flare the conduit ends so the strap will slide unimpeded through the end. The conduit must fit snugly or tightly inside the noodle.
Noodles have various size centre holes, some are solid...no hole. Clark rubber or some $2 dollar shops carry the smaller diameter centre hole noodle.