I've just stripped down the Cyclone from my Dyson DC39, replacing the foam gasket at the very top.
I'm having problems refitting the large rubber O ring/seal which sits just below the top section. It won't stay in place, even with an extra pair of hands to help. The rubber seems to have lost its stretch, and I'm wondering if it's starting to perish and no longer able to grip. I have been looking for a replacement seal, but neither Manchester Vacs or anyone else seems to have them.
Any ideas please?