After much use the hammer's surface needed to be straightened. So they would hit it against the anvil. And that was מַכֶּה בְּפַּטִישׁ.

Straightening the Hammer

They would hammer out vessels from metals. The last blow that straightened the last part was the מַכֶּה בְּפַּטִישׁ.

Forming Vessels

The קרשים were overlaid with a thin casing of gold that was nailed into the קרש. The final hammer blow of a golden nail to connect the cover to the plank was the מַכֶּה בְּפַּטִישׁ.

Nailing Gold onto קרש

​3 Possibilites of the אב מלאכה

Any act of creatig, perfectin or repairing an item can be considered an "act of completion" and be classified as מכה בפטיש.

מלאכת מחשבת of מכה בפטיש.

1. Making a hook out of a wire hanger.

2. detaching pages in a new book

3. inserting laces into shoes.

​​Creating/Perfecting

1. Connecting a new pendant to a necklace.

2. Rubbing off tailor chalk marks.

1. Straightening a bent pair of glasses.

2. replacing a detached handle of a pot.

אסור מדרבנן

You might come to fixing or its very similar to fixing

1. Separating Challah

2. Infusing Scent into garment or objects this creates a new entity.

3. Folding linens and garment on original fold( improves garment)

4. Toiveling Keilim (making them ready for use)

5. Playing Musical Instrument (making

1. fixing a crushed hat

2. fixing up a shaitel is mostly in shape.

3. putting key into key ring

4. putting a pendant that fell out back in.

5. putting in a lace of a hood that came out.

​​Simple Restoration

1. winding up a toy to go forward

2. screwing a baby bottle top.

3. buttons, zippers, buckles

4. some say wind up toys are like watches and are אסור.

​​Mode of Use דרך תשמישו

​מותר