Where two pieces of metal are to be fixed together so that they can be taken apart again, machine screws with nuts on them, or bolts,22 will be found useful.

A good kind of rivet for small work is known as tinner's rivets; they are made of iron and have a length of 5/32 of a inch. Now a rivet can either be hammered down so that the point spreads out and forms a burr, or a washer, which is called a burr, can be slipped down over it and the end then peined down. Copper-rivets as small as 1/4 inch in length can be bought at most hardware stores.