I search an original idea about a special key ring, a key ring for mechanicians and people who like mechanics.
For that I used a small piston with connecting rod .I found this piston in a small jack hammer broken.
Step 1: Material :
1:Piston with connecting rod
Step 2: Searching for Small Piston With Connecting Rod
I don't have a picture for the jackhammer,but i can give you an information just search in small jackhammers broken ( jackhammer of 4kg).You can find two kinds of piston with connecting rod in small jackhammers:
you can find plastic piston and plastic rod or steel piston and steel rod.
In my opinion , i prefer the steel .
Step 3: Assembling the Piston and the Key Ring
In the final step, i assembled the piston with connecting rod with the key ring and I get a piston with connecting rod key ring .