Pump to deflate SIM

[Crwban]

I have 2 10cm Skandika SIMs - I love them but they are a pain to pack away. I have managed with simple electric inflators but always have to 'adapt' the suction by placing fingers and thumbs over holes and vainly trying to plug gaps.

Is there a product out there that can fit properly over the SIMs screw valve? Thanks.

I can't find a picture of the valves to see how different they are to my SIM, but to deflate mine, I open and close the valve several times whilst sitting ungainly on it. So open, squish, close, fold SIM a bit more, open, squish, close etc. Then I roll tightly from the other end, opening and closing when needed.

It's what I do now Prof but this year I'm trying desperately to make it easier for DD's to do alone - my back
Is giving me loads of gyp at the mo.