The best kind are oiled so that glue will not adhere to them.

In adjusting the jaws, if the handle of the middle spindle is held in one hand, and the handle of the end spindle in the other hand, and both are revolved together, the jaws may be closed or opened evenly, Fig.174.In use care must be taken to keep the jaws parallel, in order to obtain the greatest pressure and to prevent the spindles from being broken.

It is always important to have the jaws press on the work evenly.

To secure this, the middle spindle should be tightened first, and then the end spindle.

Handscrews are convenient for a great variety of uses, as clamping up glued pieces, holding pieces together temporarily for boring, Fig.