DD got a spacehopper for Christmas but we can't get it inflated. The stopper which appears to remain in it prevents the valve from the pump connecting fully & you're blowing air out rather than in all the time. anyone else got one & solved the problem or have any ideas. I've emailed the company but think they must be closed for the hols. TIA My very whiny 5 year old's life may be depending on your help [end of tether emoticon]