Failure at inflating car tires

 In the recent cold weather my tires informed me they were below the recommended level of 35psi. Since I have a portable tire inflator I worked hard at getting them up to snuff, Only got two up there. Each one took at least 12 tries to get the valve snapped on. You have to flip the lever down at the same time you are pushing it down far enough to engage properly. Luckily it was 20 degrees out when I worked on it and since I'm retired I didn't have to get them filled at 7am when it was 1F. Two handed and this wouldn't be a problem at all. One handed is almost impossible.