This instructable will show you how to improve an inexpensive scroll saw. This type of scroll saw typically accepts blades with pins, but comes with adapters for pinless blades, which are more commonly used. Specifically, I obtained this scroll saw from harbor freight tools, which I think is a great place for hobby tools.
Although you can purchase knobs, they are typically very expensive. For me, a #10-32 screw costs $0.09 versus a knob which costs $2.80 which I found at a local Ace Hardware store. I will show you how I made my own knobs for less.
Step 1: Original Adapter
For reference, this is the original adapter. To use pinless blades, the blade must be inserted between two adapters and tightened with a hex-wrench. When there is no tension on the blade, it does not stay on the scroll saw body and falls off, since tension holds the adapter to the scroll saw.
Step 2: Drill and Mark
Find and drill a piece of wood. The holes should be far enough apart, to prevent the knobs that will be created from interfering with one another. A drill press should be used to make a straight hole. A compass should be used to draw circles around the drilled holes for the knobs.
Step 3: Wax and Level
In this step, wax the wood. I used a candle and applied it quickly to create friction. Level it using a razor blade; this will fill in and even the surface. Most importantly, it will prevent the epoxy used to make the knobs from sticking.
Step 4: Measure, Clean, and Ready
The depth of the screws should be measured so that they extend out of the wood, and so that there is a small gap between the head and the wood. This will allow the epoxy to completely surround the head. Dept is indicated by how far the screw extends out of the wood. Lastly, the screws should be cleaned with acetone and pulled out somewhat to allow for the epoxy to be put underneath the head.