Car jack mechanisms

 Here are some videos on how different car jack mechanisms work:

1. Scissor screw car jack

https://www.youtube.com/watch?v=QeB2YxMqogI

2. Hydraulic car jack

https://www.youtube.com/watch?v=1_FaqUBAYLQ

Creating a greeting card using linkages

Hi, here are some videos on how to make greeting cards using linkages:

Greeting card using 4 bar linkage:

https://www.youtube.com/watch?v=g-6tTY8iKUg

Greeting card using a bell crank linkage:

https://www.youtube.com/watch?v=Vzxl_s8OwwA

Greeting card using sliding mechanism:

https://www.youtube.com/watch?v=uQK1huGveJM