it might be too late, but I have used a hoover attachment for this function before, which you might have lying about the house. like one of the tubes in the image below
Cheers, didn't think of that despite using the Hoover immediately after realising I needed a solution. I went to Brixton Cycles in the end (not LBS at all) and they sorted it for me.
it might be too late, but I have used a hoover attachment for this function before, which you might have lying about the house. like one of the tubes in the image below