1.The material is long bolt,nut and pipe.

2.Expand M10 nut inside diameter to 12mm when to put a SUS pipe of outside diameter 12mm in.

3.Cutting a SUS pipe in length 135mm.

4.Put a long bolt in a SUS pipe. and drilling a 3 holes of 3mm.

5.The 3 holes are stuck using a hacksaw and a file, and I made a long hole. spring-roll-pin moves in this ditch.

6.Drum a spring-roll-pin of 3mm into a pipe and bolt. And shave a projection of a pin.

7.Drillig 3.2mm.

8.Drum a pin.

9.Drilling 5mm for M6 pilot hole.

10.Tapping M6.

11.Put an aluminum pipe in M6 circle screw. And tighten a screw from both sides.

12.The material of the pedestal in which a pipe is put is a beech.

13.The pilot hole 9mm to insert nut.

14.Make a seat with SPF material. and Stick a skid rubber on the back..

15.Completion.

16.Take on a front wheel fork.

I loaded a bicycle into the back seat of my car