A quick review of the Hirame Yoko pump head.

Mine did not come with directions. Or maybe it did, but it was in Japanese? I can't recall. At any rate, it's pretty simple to use. Just slap it over the valve and squeeze the lever to tighten the chuck. Pump it up. Unlike with Silca track pumps, there's no need to rotate the valve to the floor so that it faces up.

The barrel of the chuck adjusts the tightness of the rubber washer/seal, and therefore the lever which squeezes it. It all remains kind of comically loose. It seems like it's wrong or broken, but it works great and holds its adjustment. If you do need to change it, it's super easy.

Compared to a stock SKS head it's 10x easier to use. The SKS heads are kind of stiff, and when the lever is released, it would always slam my thumb. On the plus side they come free with the pump and supposedly work with both schrader and presta valves. I don't have schraders to try. That's probably why it feels stiff. They do work fine, until you try the fancy Japanese heads, and realize what a good pump head is.