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Step 2Mechanism
Constructing the mechanism:
Find a small tube about the size of a pencil. Many materials can be used, I n my case I am using some aluminium tubing found around the workshop. The next step is to find a solid cylindrical piece of steel, In my case I am using a stainless steel bolt.
Making it fit:
It is better if the bolt (or whatever you are using as the mechanism) is larger then the tube its going to fit into (the aluminium tube). To make the bolt tit inside the tube is a somewhat time consuming process. Begin by sawing off the head of the bolt, this will make it much easier to work with. Then put the bolt in a drill press (or lathe if you have one) and begin filing and sanding until it smoothly fits inside the tube.
Creating the pin screw.
Once you are satisfied that is can slide in and out the tube freely, its time to begin creating the pin screw. This is the part that allows you to have inter-changeable needles, to prevent infection and stuff. Firmly place the mechanism in a vice and begin filing away until you are halfway through. Now find (guess) the center of the flat surface you have created and tap it with a nail. Once you are happy with the placement of the dent its time to find a small drill bit with a screw matching in size. Drill the hole the try the screw out, I had to go through several screws since the metal was so tough it kept killing the threads. I'd recommend the use of a thread taper or something more effective.
Find a small tube about the size of a pencil. Many materials can be used, I n my case I am using some aluminium tubing found around the workshop. The next step is to find a solid cylindrical piece of steel, In my case I am using a stainless steel bolt.
Making it fit:
It is better if the bolt (or whatever you are using as the mechanism) is larger then the tube its going to fit into (the aluminium tube). To make the bolt tit inside the tube is a somewhat time consuming process. Begin by sawing off the head of the bolt, this will make it much easier to work with. Then put the bolt in a drill press (or lathe if you have one) and begin filing and sanding until it smoothly fits inside the tube.
Creating the pin screw.
Once you are satisfied that is can slide in and out the tube freely, its time to begin creating the pin screw. This is the part that allows you to have inter-changeable needles, to prevent infection and stuff. Firmly place the mechanism in a vice and begin filing away until you are halfway through. Now find (guess) the center of the flat surface you have created and tap it with a nail. Once you are happy with the placement of the dent its time to find a small drill bit with a screw matching in size. Drill the hole the try the screw out, I had to go through several screws since the metal was so tough it kept killing the threads. I'd recommend the use of a thread taper or something more effective.
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