If you don't have suitable vertical surface, get a file holder that sits on the countertop.

如果没有合适的垂直平面可以利用，就在台面上放一个文件夹。

youdao

3 samples of vertical clip on the holder. Clip shoulds not be too tight or too loose, to prevent deformation or fall off.

将试样垂直夹在夹持器上。夹的不宜过紧或过松，以防止试样变形或脱落。

youdao

By dint of the design, the utility model can ensure the accuracy and the stability of the exchange cutter holder in vertical displacement and horizontal swinging.

凭借以上的设计，可确保所述的交换 刀臂在垂直位移在与水平摆转时的精确度以及稳定性。

youdao

The holder start in a locked vertical position, and to attach a lens you just bayonet it into place, securing the glass and allowing the holder to be lowered.

ENGADGET: Insert Coin: Quikdraw targets lens fumblers and multiple camera packers (video)