It may sound difficult, but actually a homemade jelq machine is very simple to make. There are quite a few websites that show exactly how to go about making a homemade jelq machine.
The best thing is the money saving. Jelq machines are sold for anything above $60, but a homemade jelq machine can be made for less than $10. This is one of the reasons people are going ahead to make their own equipment.
However, you have to carefully read the instructions and build your homemade jelq machine in the right way. If anything goes wrong, it will have no effect for the enlargement you are looking at or, worse, it might injure the penis.