I have some insulation to push into some awkward spaces, including through
a narrow (~1") aperture. Insulation (even PIR) is not known for its rigidity
under compression. I'm probably looking at multifoil or thin PIR, with
stuffing in fibreglass as a backup plan.

Are there tools that would be useful for this?
It really wants things that can not only push (or pull the far end or a
loose thing), but also disengage when the
insulation is in position.


So far I've come up with:

Cable rods, eg:
https://www.toolstation.com/hand-tools/cable-rods/c1152
- I'm not sure whether these are going to bend if they meet any obstacles?

Drain rods
- similarly, only perhaps more robust?

Fire irons
- good in compression, strong and long, but usually rather chunky (cast iron
etc)

Litter grabbing tool
- might do it, although many are quite fat?


Any suggestions what else might do this job?

Thanks
Theo